Rep. Matt Gaetz (R-Fla.) tweeted a threat to President Trump's former personal attorney Michael Cohen on the eve of his public testimony before the House Oversight Committee.

Why it matters: Cohen originally postponed his appearance before various congressional committees in part because of "threats against his family" from Trump and his attorney Rudy Giuliani. Gaetz, a Trump loyalist, recently told the New York Times that he's proud that scrutiny of investigations by congressional Republicans — including branding the Mueller probe as a "witch hunt" — has "aided in the president's defense."