Washington (CNN) House Speaker Nancy Pelosi said Friday that Attorney General William Barr has "gone rogue," citing the Justice Department's handling of the Ukraine scandal, adding that House Democrats will not rush their impeachment inquiry into President Donald Trump.

"You never know where we're going next. Now, I think we're getting involved in the coverup of the coverup, and that may be something that will take some time to investigate," Pelosi said in an interview with CNN on Capitol Hill.

Pelosi declined to provide a timeline of when the House Intelligence Committee she has tasked with leading the impeachment inquiry would conclude their work.

"They will do the work that they're set out to do, following the facts and the time that it takes to find the facts," she said.

A White House transcript released this week showed that Trump asked Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden, a 2020 candidate, and Biden's son. There is no evidence of wrongdoing by either Joe or Hunter Biden. Trump also asked Zelensky to work with Barr and his personal lawyer, Rudy Giuliani on the issue, the call transcript revealed. Trump has denied he did anything improper.