Only five members of the U.S. House of Representatives have ever been expelled from the institution. This week, Representative George Santos, Republican of New York, could become the sixth. In a damning ethics report, House investigators found that the congressman spent tens of thousands of dollars in political contributions on Botox, Ferragamo goods and vacations. Grace Ashford, who covers New York State politics and government for The Times, explains why, after a year in office, so many of Mr. Santos’s colleagues have had enough.