Republican legislators are voicing concerns over some aspects of President Trump’s visit to Saudi Arabia, Qatar, and the United Arab Emirates (UAE). They are uneasy about the president accepting a luxury jet from Qatar and are wary of the Trump family’s profitable business engagements in Qatar and the UAE.

On Capitol Hill, Republicans are questioning whether Trump has adequately involved Israel in negotiations with Yemen’s Houthi rebels and the administration’s discussions with Iran regarding its nuclear agenda.

Trump announced a deal to stop bombing the Houthis shortly before his trip, and his administration’s negotiations with Iran are ongoing.

The president’s contentious move to accept a $400 million Boeing 747-8 from Qatar, intended to be the next Air Force One and later part of his presidential library, has encountered the most significant opposition from GOP lawmakers.

Sen. Todd Young (R-Ind.), a member of the Senate Intelligence Committee, said he wasn’t comfortable with Trump using the jet from Qatar to become his mobile command center in the sky.

“I’m not comfortable accepting it,” he said. “I think there are national security concerns that need to be addressed about listening devices, safety specs and potentially other issues.

“We will ask that those be addressed,” he added.

Sen. Ted Cruz (R-Texas) warned the gift of the plane “poses significant espionage and surveillance problems.”

“I’m not a fan of Qatar. I think they have a really disturbing pattern of funding theocratic lunatics who want to murder us, funding Hamas and Hezbollah. And that’s a real problem,” he said Tuesday on CNBC’s “Squawk Box.”

Senate Majority Leader John Thune (R-S.D.) told reporters there would be “plenty of scrutiny” of the Qatari airplane deal if it’s finalized.  

Qatar’s track record of supporting groups hostile to U.S. interests is making Republican senators uneasy about the Trump family’s involvement in a $5.5 billion plan to build a beachside luxury community and golf resort in Qatar.

The Trump family company announced the deal April 30, two weeks before the president was scheduled to depart for the Middle East.

GOP senators are also privately voicing their concerns about the Trump family’s stake in a crypto company involved in a $2 billion transaction with an Emirati firm based in Abu Dhabi.

A Republican senator who requested anonymity said Trump needs to be mindful of how his business deals in foreign countries appear to Americans at a time when he’s reaching out to those countries diplomatically.

“There’s image and reality, and both are important. The appearance of relationships and things that result from those relationships affect trust,” the lawmaker warned. “We need to make certain that public officials are clean in the transactions that they do.”

The Washington Post reported Tuesday that an entity affiliated with Trump and his family has a 60% stake in the crypto company World Liberty Financial, which is involved in the $2 billion transaction with UAE-backed investment firm MGX.

A second Republican senator who requested anonymity said the Trump family’s business dealings in Qatar and the UAE are creating an optics problem and criticized the president’s decision to accept the luxury jet from Qatar as “flagrantly” poor judgment.

“There’s an awareness that could not look right,” the senator said of potential conflicts of interest posed by Trump’s family business dealings.

“It’s coming into higher profile with this Air Force One proposal coming out of Qatar,” the lawmaker added. “It’s going to be hard to not recognize what we’re seeing.”

Publicly, GOP senators are reacting cautiously to Trump’s business interests in Qatar and UAE.

Sen. Thom Tillis (R-N.C.) said Trump needs to be transparent in his business deals to address accusations that he is self-dealing or enriching himself and his family.

“All that just has to pass transparency,” he said Wednesday. “I think the best way to address it is to make it very clear there are legal business transactions and be transparent about it.”

Trump’s trip has given Democrats the chance to play offense and accuse the president of corruption.

Senate Democratic Leader Chuck Schumer (D-N.Y.) said Trump’s trip to the Middle East “seems less like a presidential visit and more like a personal business venture.”

“Golf courses by the beach, hotel openings in Dubai, billions in investments towards Trump stablecoins. All of that enriches Donald Trump,” he said on the Senate floor. “Is that what American foreign policy is all about? To make a rich president richer?”

He called on Senate Republicans to “speak up.”

“Some of our Republican colleagues, to their credit, have said they have some concerns about the Qatar deal. Well, how about showing it? How about showing some outrage?” he said.

Sen. Rick Scott (R-Fla.), one of Trump’s staunchest allies on Capitol Hill, said the families of prominent politicians and officeholders need to understand that their business dealings will come under scrutiny.

“You never want to prevent somebody from being able to do business,” he said.

But he expressed strong distrust of the Qatari government.

“I don’t support Qatar. I don’t trust them as a government, but people get to make their own independent decisions on [whom] they do business with,” he said.

“If you’re related to a politician — I tell my family, if you ever do anything, understand there’s always going to be more scrutiny in whatever you do,” he added.

Scott said he doesn’t understand how Trump’s Secret Service team and national security officials would be able to assure his safety on a plane accepted from Qatar.

“I don’t know how we protect his safety,” he said. “Qatar supports Hamas. … I just don’t know how you make the plane safe. This plane’s a gigantic plane.”

Trump’s trip to the Middle East and the diplomacy that preceded it have raised other questions on Capitol Hill.

Some Republican lawmakers are now taking a closer look at Trump’s announcement May 6 that the United States will stop bombing Houthi rebels in Yemen in exchange for the Iranian-backed militant group stopping attacks on shipping in the Red Sea.

Lawmakers in both parties are questioning why the deal did not also stop Houthi attacks on Israel. The Israeli military said Wednesday that it had intercepted a missile launched at it from Yemen.

Sen. John Cornyn (R-Texas) said “we support Israel” and acknowledged that continued Houthi attacks against Israel are “a problem.”

“But stopping them from attacking ships in the Red Sea is progress,” he said.

Democrats claimed Trump is showing a “cold shoulder” to Israel while he courts Arab states.

Sen. Chris Coons (Del.), a senior Democrat on the Senate Foreign Relations Committee, said Trump’s trip “is a stunning cold shoulder to Bibi Netanyahu,” referring to Israel’s prime minister.

“He’s not visiting Israel. He stopped his campaign against the Houthis without any guarantee that the Houthis would stop attacking Israel. And he’s publicly saying that there are no permanent friends and no permanent enemies in a region where Iran’s aggression against Israel is present in every conversation,” Coons said.

Trump’s efforts to strengthen ties with Saudi Arabia, Qatar and the UAE come at a time when there appears to be growing tension between the United States and Israel over U.S. policy in the region.

Haaretz, a leading Israeli news source, reported that Netanyahu told his Cabinet on Sunday that Israel needs to start thinking about weaning itself off of U.S. military assistance.

The Trump administration largely bypassed Israel in its negotiations with Hamas to bring Edan Alexander, the last American hostage in Gaza, home.

Israeli officials and Israel-allied Republican senators are closely tracking the Trump administration’s negotiations with Iran to end its nuclear armament program.

Several Republican lawmakers voiced skepticism Wednesday of Iran adhering to any deal reached with Trump, but they praised Trump’s pledge to achieve “full dismantlement” of Iran’s nuclear program.

Tillis said he’s skeptical of any negotiations with Iran.

“What I like most about it is that there’s zero tolerance for [uranium] enrichment,” he said of Trump’s negotiating position. “I’m glad the administration drew that line, I hope they stick with it.”

But the North Carolina senator said “a lot of people are wondering” about the new Trump administration’s posture toward Iran and the broader Middle East.

“Anything that would appease and normalize relations with Iran, it would be hard-pressed to get me to [support] unless we see a change in the [Iranian] regime,” he said. “I don’t think that this regime is going to change, but they’ll use different lies to achieve the same ends.

“I am skeptical,” he added of the diplomatic outreach to Iran. “You’ve got to engage, but I am skeptical. They’re just not trustworthy.”

Cornyn, a member of the Foreign Relations Committee, warned: “There has to be complete dismantlement of Iran’s nuclear capabilities.

“That’s the president’s stated goal,” he added.