The Washington Post summarizes what Cohen is expected to discuss:
Michael Cohen, President Trump’s former fixer and personal lawyer, returns to Capitol Hill Wednesday for public testimony before the House Oversight Committee in what is expected to be a compelling appearance.
Cohen will allege — amid a stream of potentially damaging revelations about the president — that Trump knew in advance that the anti-secrecy organization WikiLeaks planned to publish hacked Democratic National Committee emails, and he will describe the president as a “racist,” a “conman” and a “cheat,” according to a copy of his written testimony.
The WikiLeaks allegation is perhaps the most explosive in the written testimony, speaking to the core of special counsel Robert S. Mueller III’s probe into whether the Trump campaign coordinated with Russia to influence the election. Mueller already has alleged that Russian military officials hacked the emails before they were published online by groups including WikiLeaks.
We’ll update this post as news develops.