Former Representative Peter Meijer, who lost his Republican House primary last year after voting to impeach President Donald J. Trump, has formed an exploratory committee to run for Senate in Michigan. Mr. Meijer filed paperwork with the I.R.S. this week and confirmed the creation of the committee — which allows him to raise money before formally declaring a campaign — in a text to The New York Times on Thursday. The news was previously reported by The Detroit Free Press. If he moves forward, Mr. Meijer, 35, would be the first well-known Republican to enter the race for the seat...