With two wins, Cruz stakes claim as Trump's main Republican rival

Republican presidential contender Ted Cruz solidified his claim to be front-runner Donald Trump's prime challenger by splitting four nominating contests with the real estate mogul, and both turned their attention to a crucial showdown in Michigan on Tuesday. The wins for Trump and Cruz on Saturday were a setback for a Republican establishment that has largely lined up behind Marco Rubio, a U.S. senator who was shut out in the four contests. "I think it's time that he dropped out of the race," Tr