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 railed against Jennifer Williams, a career foreign service officer and staffer to Vice President Pence, after she told lawmakers in closed-door testimony that Trump's July 25 call with Ukrainian President Volodymyr Zelensky at the center of the impeachment inquiry was “inappropriate.”

“Tell Jennifer Williams, whoever that is, to read BOTH transcripts of the presidential calls, & see the just released ststement from Ukraine,” the president tweeted Sunday afternoon. “Then she should meet with the other Never Trumpers, who I don’t know & mostly never even heard of, & work out a better presidential attack!”

Tell Jennifer Williams, whoever that is, to read BOTH transcripts of the presidential calls, & see the just released ststement from Ukraine. Then she should meet with the other Never Trumpers, who I don’t know & mostly never even heard of, & work out a better presidential attack! — Donald J. Trump (@realDonaldTrump) November 17, 2019

Trump also used the label “Never Trumpers” to attack diplomat William Taylor and State Department official George Kent after they testified in the impeachment inquiry last week.

He also took aim at what he called “Crazed, Do Nothing Democrats” in a tweet moments later, accusing them of “turning Impeachment into a routine partisan weapon. That is very bad for our Country, and not what the Founders had in mind!!!!”

“Republicans & others must remember, the Ukrainian President and Foreign Minister both said that there was no pressure placed on them whatsoever,” he wrote in another tweet. “Also, they didn’t even know the money wasn’t paid, and got the money with no conditions. But why isn’t Germany, France (Europe) paying?”

The Crazed, Do Nothing Democrats are turning Impeachment into a routine partisan weapon. That is very bad for our Country, and not what the Founders had in mind!!!! — Donald J. Trump (@realDonaldTrump) November 17, 2019

Republicans & others must remember, the Ukrainian President and Foreign Minister both said that there was no pressure placed on them whatsoever. Also, they didn’t even know the money wasn’t paid, and got the money with no conditions. But why isn’t Germany, France (Europe) paying? — Donald J. Trump (@realDonaldTrump) November 17, 2019

On Saturday, House Democrats released a transcript of Williams’s closed-door testimony with lawmakers as part of the chamber’s ongoing impeachment inquiry into Trump.

During her deposition, Williams testified that she has firsthand knowledge of the July 25 phone call between Trump and Zelensky as one of the officials on the call.

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Williams testified that she found a few references made in the phone call — during which Trump asked Zelensky to look into former Vice President 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 and his son Hunter Biden as well as the hack of the Democratic National Committee server in 2016 — to be “unusual, and more of a political nature.”

When pressed by Rep. Eric Swalwell Eric Michael SwalwellHouse to vote on resolution affirming peaceful transition of power Swalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions MORE (D-Calif.) on her feelings about the concerns raised by Trump during the call, Williams testified that she “found them to be more political in nature and, in the context of a foreign policy – or an engagement with a foreign leader, to be more political than diplomatic.”

“Some people would say that diplomacy itself is inherently political, and so everything diplomatic is, by definition, political also, but you had a strong reaction to that. Can you spell out what you saw improperly political about those mentions?” Rep. Jamie Raskin Jamin (Jamie) Ben RaskinOVERNIGHT ENERGY: House passes sweeping clean energy bill | Pebble Mine CEO resigns over secretly recorded comments about government officials | Corporations roll out climate goals amid growing pressure to deliver On 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 House panel pulls Powell into partisan battles over pandemic MORE (D-Md.) asked Williams during her testimony.

“I believe I found the specific mentions to be – to be more specific to the president in nature, to his personal agenda ... as opposed to a broad foreign policy objective of the United States,” Williams responded.

"I guess for me it shed some light on possible other motivations behind a security assistance hold," she added.

Williams is expected to testify publicly next week as part of the ongoing impeachment inquiry into Trump.