Schiff says Mulvaney walk-back not 'the least bit credible'

White House chief of staff Mick MulvaneyMick 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's walk-back of comments indicating the Trump administration held up aid to Ukraine to ensure it investigated issues related to the 2016 election was not "the least bit credible," House Judiciary Committee Chairman Adam SchiffAdam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) said Friday. 

"What's your reaction to the Mulvaney walk-back last night? Was that enough to satisfy your concerns?" CNN's Manu Raju asked Schiff Friday. 

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"I didn't find it the least bit credible," he responded. 

"Why is that?" Raju asked. 

"I think it's pretty obvious," Schiff said.

Mulvaney issued a statement Thursday afternoon accusing the media of "misconstruing" his earlier remarks that suggested there was a quid pro quo deal between the U.S. and Ukraine that led the Trump administration to withhold approved military aid.

Mulvaney at the earlier news conference said the nearly $400 million in assistance was held up in part because Trump wanted Kiev to investigate an unproven conspiracy theory about Ukraine's involvement in the hack of the Democratic National Committee server in 2016. 

Those on-camera remarks contradicted repeated statements from officials who had insisted there was never a quid pro quo between Trump and Ukraine involving the aid, which had been help up by the administration. It was eventually delivered.

Schiff, a key player in the impeachment drive by House Democrats who is a frequent target of the president's, told reporters Thursday that Mulvaney's "acknowledgment" of such a move "means that things have gone from very, very bad to much, much worse."