President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE on Tuesday confirmed that he withheld funds from Ukraine amid growing furor over his interactions with the country, arguing he did so because he wanted European nations to contribute more to the cause.

"I want other countries to put up money. I think it’s unfair that we put up the money. Then people called me and said, 'Oh, let it go,' and I let it go," Trump told reporters at the United Nations.

During a meeting later Tuesday morning with British Prime Minister Boris Johnson, Trump said he spoke with acting chief of staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE, Vice President Pence, Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE and Commerce Secretary Wilbur Ross Wilbur Louis RossTrump admin asks Supreme Court to fast-track excluding people in U.S. illegally from census Trump 'very happy' to allow TikTok to operate in US if security concerns resolved TikTok, WeChat to be banned Sunday from US app stores MORE about the aid and questioned why European nations weren't doing more.

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"So I said, 'Hold it up, let's get other people to pay,' " Trump said. "And then everybody called me, 'Oh please, can we pay it?' "

"And there was never any quid pro quo," he added, before criticizing Hunter Biden's role on the board of a Ukrainian gas company while his father, Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, was vice president.

Multiple news outlets reported Monday night that Trump ordered millions of dollars in military aid for Ukraine be withheld just days before a July 25 call with Ukrainian President Volodymyr Zelensky. Trump has since acknowledged that he brought up Joe Biden, the current 2020 Democratic presidential front-runner, as well as corruption on the same call, alarming Democrats.

Trump on Tuesday indicated he had no regrets about holding up the funds, which were intended to help Ukraine combat Russian aggression, saying France, Germany and others should put forward more money. The funds were released after lawmakers in both parties criticized the delay.

"Those funds were paid. They were fully paid but my complaint has always been — and I’ll withhold again and I’ll continue to withhold until such time as Europe and other nations contribute to Ukraine, because they're not doing it," Trump said.

The president has twice denied there was any explicit quid pro quo involving the aid and an investigation into Biden and his son's activities in Ukraine.

Trump is scheduled to meet with Zelensky on Wednesday on the sidelines of the United Nations.

More than a dozen Democrats have come out in favor of impeachment since Monday as information trickles out about Trump's interactions with Ukraine, which were first raised in a whistleblower complaint filed last month.

"It’s nonsense, and when you see the call, when you see the readout of the call, which I assume you’ll see at some point, you’ll understand. That call was perfect," Trump said Tuesday, dismissing the calls for impeachment.

Updated: 12:24 p.m.