WASHINGTON (AP) — Dick Cheney, a formidable conservative figure known for his influential and often divisive tenure as vice president, passed away at 84. Cheney was a prominent advocate for the Iraq invasion, leaving an indelible mark on U.S. politics.

According to a family statement, Cheney succumbed to complications arising from pneumonia, along with cardiac and vascular disease, on Monday night.

“For decades, Dick Cheney served our nation,” the family statement reflected, highlighting his roles as White House Chief of Staff, Wyoming Congressman, Secretary of Defense, and Vice President. “Dick Cheney was a great and good man who taught his children and grandchildren to love our country, and to live lives of courage, honor, love, kindness, and fly fishing. We are grateful beyond measure for all Dick Cheney did for our country. And we are blessed beyond measure to have loved and been loved by this noble giant of a man.”

Cheney, known for his quiet yet commanding presence, played pivotal roles under two presidents from the same family. He served as defense secretary during the Persian Gulf War under President George H.W. Bush and later returned to the political arena as vice president to George W. Bush.

In the Bush administration, Cheney acted as the de facto chief operating officer, significantly influencing key presidential policies. He was deeply involved in decisions, particularly those aligned with his interests, while managing a long battle with heart disease and undergoing a heart transplant after his term. Cheney staunchly supported the extensive surveillance and interrogation practices initiated in the aftermath of the September 11, 2001 terror attacks.

Post-politics, Cheney found himself at odds with President Donald Trump, especially as his daughter, Liz Cheney, emerged as a prominent Republican critic of Trump. She vocally opposed Trump’s efforts to overturn his election defeat and scrutinized his involvement in the January 6, 2021, Capitol riot.

“In our nation’s 246-year history, there has never been an individual who was a greater threat to our republic than Donald Trump,” Cheney said in a television ad for his daughter. “He tried to steal the last election using lies and violence to keep himself in power after the voters had rejected him. He is a coward.”

In a twist the Democrats of his era could never have imagined, Dick Cheney said last year he was voting for their candidate, Kamala Harris, for president against Trump.

A survivor of five heart attacks, Cheney long thought he was living on borrowed time and declared in 2013 he now awoke each morning “with a smile on my face, thankful for the gift of another day,” an odd image for a figure who always seemed to be manning the ramparts.

His vice presidency defined by the age of terrorism, Cheney disclosed that he had had the wireless function of his defibrillator turned off years earlier out of fear terrorists would remotely send his heart a fatal shock.

In his time in office, no longer was the vice presidency merely a ceremonial afterthought. Instead, Cheney made it a network of back channels from which to influence policy on Iraq, terrorism, presidential powers, energy and other cornerstones of a conservative agenda.

Fixed with a seemingly permanent half-smile — detractors called it a smirk — Cheney joked about his outsize reputation as a stealthy manipulator.

“Am I the evil genius in the corner that nobody ever sees come out of his hole?” he asked. “It’s a nice way to operate, actually.”

A hard-liner on Iraq who was increasingly isolated as other hawks left government, Cheney was proved wrong on point after point in the Iraq War, without ever losing the conviction that he was essentially right.

He alleged links between the 2001 attacks against the United States and prewar Iraq that didn’t exist. He said U.S. troops would be welcomed as liberators; they weren’t.

He declared the Iraqi insurgency in its last throes in May 2005, back when 1,661 U.S. service members had been killed, not even half the toll by war’s end.

For admirers, he kept the faith in a shaky time, resolute even as the nation turned against the war and the leaders waging it.

But well into Bush’s second term, Cheney’s clout waned, checked by courts or shifting political realities.

Courts ruled against efforts he championed to broaden presidential authority and accord special harsh treatment to suspected terrorists. His hawkish positions on Iran and North Korea were not fully embraced by Bush.

Cheney operated much of the time from undisclosed locations in the months after the 2001 attacks, kept apart from Bush to ensure one or the other would survive any follow-up assault on the country’s leadership.

With Bush out of town on that fateful day, Cheney was a steady presence in the White House, at least until Secret Service agents lifted him off his feet and carried him away, in a scene the vice president later described to comical effect.

From the beginning, Cheney and Bush struck an odd bargain, unspoken but well understood. Shelving any ambitions he might have had to succeed Bush, Cheney was accorded power comparable in some ways to the presidency itself.

That bargain largely held up.

“He is constituted in a way to be the ultimate No. 2 guy,” Dave Gribbin, a friend who grew up with Cheney in Casper, Wyoming, and worked with him in Washington, once said. “He is congenitally discreet. He is remarkably loyal.”

As Cheney put it: “I made the decision when I signed on with the president that the only agenda I would have would be his agenda, that I was not going to be like most vice presidents — and that was angling, trying to figure out how I was going to be elected president when his term was over with.”

His penchant for secrecy and backstage maneuvering had a price. He came to be seen as a thin-skinned Machiavelli orchestrating a bungled response to criticism of the Iraq war. And when he shot a hunting companion in the torso, neck and face with an errant shotgun blast in 2006, he and his coterie were slow to disclose that extraordinary turn of events.

The vice president called it “one of the worst days of my life.” The victim, his friend Harry Whittington, recovered and quickly forgave him. Comedians were relentless about it for months. Whittington died in 2023.

When Bush began his presidential quest, he sought help from Cheney, a Washington insider who had retreated to the oil business. Cheney led the team to find a vice presidential candidate.

Bush decided the best choice was the man picked to help with the choosing.

Together, the pair faced a protracted 2000 postelection battle before they could claim victory. A series of recounts and court challenges — a tempest that brewed from Florida to the nation’s highest court — left the nation in limbo for weeks.

Cheney took charge of the presidential transition before victory was clear and helped give the administration a smooth launch despite the lost time. In office, disputes among departments vying for a bigger piece of Bush’s constrained budget came to his desk and often were settled there.

On Capitol Hill, Cheney lobbied for the president’s programs in halls he had walked as a deeply conservative member of Congress and the No. 2 Republican House leader.

Jokes abounded about how Cheney was the real No. 1 in town; Bush didn’t seem to mind and cracked a few himself. But such comments became less apt later in Bush’s presidency as he clearly came into his own.

Cheney retired to Jackson Hole, not far from where Liz Cheney a few years later bought a home, establishing Wyoming residency before she won his old House seat in 2016. The fates of father and daughter grew closer, too, as the Cheney family became one of Trump’s favorite targets.

Dick Cheney rallied to his daughter’s defense in 2022 as she juggled her lead role on the committee investigating Jan. 6 with trying to get reelected in deeply conservative Wyoming.

Liz Cheney’s vote for Trump’s impeachment after the insurrection earned her praise from many Democrats and political observers outside Congress. But that praise and her father’s support didn’t keep her from losing badly in the Republican primary, a dramatic fall after her quick rise to the No. 3 job in the House GOP leadership.

Politics first lured Dick Cheney to Washington in 1968, when he was a congressional fellow. He became a protégé of Rep. Donald Rumsfeld, R-Ill,, serving under him in two agencies and in Gerald Ford’s White House before he was elevated to chief of staff, the youngest ever, at age 34.

Cheney held the post for 14 months, then returned to Casper, where he had been raised, and ran for the state’s single congressional seat.

In that first race for the House, Cheney suffered a mild heart attack, prompting him to crack he was forming a group called “Cardiacs for Cheney.” He still managed a decisive victory and went on to win five more terms.

In 1989, Cheney became defense secretary under the first President Bush and led the Pentagon during the 1990-91 Persian Gulf War that drove Iraq’s troops from Kuwait. Between the two Bush administrations, Cheney led Dallas-based Halliburton Corp., a large engineering and construction company for the oil industry.

Cheney was born in Lincoln, Nebraska, son of a longtime Agriculture Department worker. Senior class president and football co-captain in Casper, he went to Yale on a full scholarship for a year but left with failing grades.

He moved back to Wyoming, eventually enrolled at the University of Wyoming and renewed a relationship with high school sweetheart Lynne Anne Vincent, marrying her in 1964. He is survived by his wife, by Liz and by a second daughter, Mary.

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Associated Press writer Mead Gruver in Cheyenne, Wyoming, contributed to this report.