WASHINGTON ― President Donald Trump’s repeated claims that the United States will “run” Venezuela after the U.S. captured Venezuelan President Nicolás Maduro and his wife, Cilia Flores, in a military operation over the weekend sparked bipartisan concern on Capitol Hill, where even some top Republicans were left scratching their heads.

“I think it needs more clarification,” Sen. Shelley Moore Capito (R-W.Va.), a member of Senate GOP leadership, told reporters on Monday. “I think the interpretation of ‘run’ has been pretty broad, and I think they’re trying to, in my opinion, trying to narrow it down.”

“It’s all unknowable. I have no idea,” added Sen. Ron Johnson (R-Wis.).

Sen. Thom Tillis (R-N.C.) said that properly administering Venezuela would require committing 100,000 U.S. troops on the ground, a policy he did not support.

“The details are very vague to me,” Tillis added.

Meanwhile, Sen. Rand Paul (R-Ky.), a critic of the Trump administration’s months-long military campaign against Venezuela, warned that Trump’s rhetoric ― no matter the intended meaning ― would backfire by turning off people in Venezuela and in other Latin American countries.

“It sounds like the 19th century,” Paul said, referring to American imperialism and decades of failed U.S. interventions in the Western Hemisphere. “It will push our friends away…It will drive a wedge between us and potential future leaders of Venezuela.”

Despite Trump’s claims, the Venezuelan government is still running the country. Venezuela’s vice president and oil minister, Delcy Rodriguez, was formally sworn in on Monday as the country’s interim president.

The Trump administration did not notify Congress in advance about the military bombardment of Venezuela’s capital city of Caracas and the U.S. mission to capture Maduras and transport him to the U.S. to face charges of “narco-terrorism.” Secretary of State Marco Rubio informed select members of Congress after the fact, a decision that drew sharp criticism from Democrats who maintain that Trump needs to seek approval for the use of force from Congress, as required by the U.S. Constitution.

But Republicans said they were satisfied with the Trump administration’s authority and stated legal rationale for the operation, describing the military bombardment of Venezuela that killed dozens of people as a law enforcement action.

“Notification of Congress in advance of really critical and hypersensitive missions, to me, seems ill-advised anyway,” Senate Majority Leader John Thune told reporters on Monday. “I felt that the notification, considering the scope of the mission, was sufficient for me.”

Since Maduro’s capture over the weekend, Trump has made threats against other countries, including Cuba, Colombia, Mexico, Iran and Greenland, a semi-autonomous territory that belongs to Denmark.

In an interview with NBC News on Monday, Trump suggested the U.S. oil industry would take over Venezuela’s oil production with the financial support of the U.S. government.

“A tremendous amount of money will have to be spent, and the oil companies will spend it, and then they’ll get reimbursed by us or through revenue,” he told the outlet.

Democrats warned that the Trump administration was repeating the steps of failed U.S. interventions abroad, including in the Middle East, which Trump himself had campaigned against.

After a congressional briefing on Monday for leadership and members of the House and Senate intelligence committees, Sen. Chuck Schumer (D-N.Y.) said the administration’s two-hour presentation “posed far more questions than it answered.”

“Their plan for the U.S. running Venezuela is vague, based on wishful thinking, and unsatisfiying,” Schumer said. “I did not receive any assurances that we would not try to do the same thing in other countries. And in conclusion, when the United States engages in this kind of regime change and so-called nation-building, it always ends up hurting the United States. I left the briefing feeling it would again.”