Trump 2nd term live updates: Dan Bongino named as deputy FBI director

As President Donald Trump continues to attack Ukrainian President Volodymyr Zelenskyy, Vance was asked at CPAC on Thursday about the status of negotiations.

"It's early," Vance said. He praised Trump, saying the president doesn't take anything off the table in negotiations.

Experts, however, have criticized Trump for seemingly ruling out NATO membership for Ukraine and Ukraine returning to its pre-war borders.

"I'll tell you the goals that animate Trump's policy. It's really simple: he wants the killing to stop, he wants to bring lasting peace to Europe -- he doesn't just want to stop it now and have the war restart a month from now -- he wants to bring lasting peace to Europe because the president believes this, and he's absolutely right, peace is in the interest of Russia, it's in the interest of Ukraine, it's in the interest of Europe but most importantly peace is in the interest of the American people."

Vice President JD Vance stoked some controversy last week with his speech at the Munich Security Conference, where he criticized European allies on immigration, free speech and other issues.

At CPAC on Thursday, he stood by the themes in his address after receiving a standing ovation from the audience.

“We cannot rebuild the United States of America or Europe by letting millions and millions of unvetted migrants come into our country and it has to stop," Vance said. He added: "You can't just stop it. You have to allow European peoples, and American people too, to raise issues about it. You have to allow free speech to debate this stop."

Asked about the future of U.S. alliances on the continent, Vance said they would continue to have "important" partnerships with Europe.

"But I really do think the strength of those alliances is going to depend on whether we take our societies in the right direction ... That friendship is based on shared values," he said.

Polygraphs that the Department of Homeland Security administers will include a question about whether the employee had unauthorized communications with the media or a nonprofit organization.

DHS Secretary Kristi Noem said leaks have stymied immigration enforcement operations and warned that polygraphs may help crack down on leakers, according to a memo described to ABC News.

Noem appeared on Fox News' "Hannity" and confirmed the use of polygraphs to weed out the "leakers," who may have leaked Immigration and Customs Enforcement operations.

"Yes, I do have suspicions," she said. "I need to be sure and I need to be certain, so we have different tools we can use and one of those is ensuring we're using polygraphs to look at all of our employees, all of these people involved in these operations, to make sure they're telling the truth on what they have done in the past that may have jeopardized our operations."

She said DHS is a "national security agency" and a "law enforcement agency" and this is one of the authorities she can use to find out who is doing the "nefarious" activity.

Bloomberg Government was first to report on the memo.

Some DHS components already use polygraph tests when an agent first onboards, for example, U.S. Customs and Border Protection.

-ABC News' Luke Barr

President Donald Trump signed an executive order on Wednesday night directing federal agencies to "identify all federally funded programs currently providing financial benefits to illegal aliens and take corrective action," according to a fact sheet released by the White House.

It intends to ensure that federal funding will not be used to "support 'sanctuary' policies or assist illegal immigration" and mandates improvements in eligibility verification.

The order also calls for identifying all other sources of federal funding for those unlawfully present in the United States, and it seeks recommendations for additional agency actions to align federal spending with the order within 30 days.

Agencies are tasked with referring "improper receipt or use of Federal benefits to the Department of Justice and the Department of Homeland Security for appropriate action."

The White House noted in its fact sheet that illegal migrants are already barred from welfare programs, raising the question of how much funding Trump might be expecting to withhold. It also fails to define "illegal alien" -- the term it applies -- for the purposes of executing this order.

- ABC News' Molly Nagle