Mueller is slated to testify in back-to-back hearings about the Russia probe and his final report before two House committees on Wednesday. The two hearings are expected to last roughly five hours combined.

Mueller's report said that there was no evidence that Trump's campaign conspired with the Russian government during the 2016 election, but did not conclude if the president had obstructed justice.

Instead, Mueller recounted 10 episodes involving Trump and discussed potential legal theories for connecting these actions with elements of an obstruction offense.

It was the DOJ that concluded that Mueller did not have "sufficient" evidence to support a charge in the obstruction case. The decision drew scrutiny from Democrats, who called for more investigations.

Mueller indicated he did not want to testify before Congress during a press conference in May, adding that his testimony would not go beyond his report. Nevertheless, his words failed to discourage Democrats from subpoenaing him to testify.

Trump said on Monday that he will not be watching Mueller testify, denouncing Democrats for "wasting their time."

Earlier in the day, he renewed his attacks on Mueller and the Russia probe.

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