Massachusetts Sen. Elizabeth Warren has been calling for President Trump's impeachment since the spring. California Sen. Kamala Harris wasn't too far behind her. New Jersey Sen. Cory Booker's been pushing for it for months.
In fact, all six U.S. senators still running for president are backing the House's impeachment inquiry.
But now that the lawmakers may be getting what they want, many political operatives see it as a train wreck for their presidential campaigns.