President Trump on Thursday night tweeted out a video showing Nancy Pelosi stumbling over her words. The video, apparently from a segment on Fox Business’ “Lou Dobbs Tonight,” features portions of a 20-minute news conference Pelosi held Thursday in a montage that lasts about 30 seconds. It shows her tripping over her words. At one point in the video, a moment is repeated several times. Drew Hammill, Pelosi’s deputy chief of staff, on Twitter called the video that Trump tweeted Thursday night “doctored” and referred to the Post article. Pelosi’s daughter Christine tweeted: “Fake video altered for speed.” It turns...