President Trump took aim at former special counsel Robert Mueller and Joe Biden late Thursday, renewing his criticism of the former vice president’s age while suggesting that Mueller’s appearance before House lawmakers on Wednesday made Biden look like a “dynamo.”

“Sleepy Joe is OK, but he’s fading; I think he’s fading fast,” Trump said of Biden’s 2020 presidential campaign in an interview with Fox News’s Sean Hannity. “The only good thing about Mueller is that it made Joe Biden look like a dynamo.”

{mosads}Trump’s remarks came in his first interview since Mueller appeared before the House Judiciary and House Intelligence committees to testify on his more than 400-page report, which detailed his investigation into Russia’s election interference and possible obstruction of justice by Trump.

Mueller’s performance in his back-to-back hearings drew widespread criticism among those who questioned his grasp of his own investigation.

While many Democrats publicly praised his testimony before the House panels, some privately expressed a sense of disappointment in Mueller’s at times shaky performance.

Trump has repeatedly attacked Mueller’s investigation as a “witch hunt” and sought to cast doubt on the report’s findings. Mueller did not charge Trump with obstruction, but has asserted repeatedly that the president was not exonerated by his investigation.

Trump, meanwhile, has sought to undermine Biden’s endurance as a top-tier presidential contender, casting the former vice president as “sleepy.”

The president on Thursday also went after other leading presidential contenders, including Sens. Elizabeth Warren (D-Mass.) and Bernie Sanders (I-Vt.). 

“You have Elizabeth Warren, formerly known as Pocahontas — and I’m sure that’ll come out because that’s a tough thing for her to withstand, I believe, because her whole life is a fake,” he said, referring to her past claims to Native American ancestry. 

“Bernie looks like to me like he’s fading,” he added of the 77-year-old Vermont senator, before saying that Sanders gave up his chance to win the Democratic Party’s presidential nomination after losing to then-candidate Hillary Clinton in 2016.