On Wednesday in Indiana, for example, Republican leaders are finalizing a delegate slate that will include party activists unlikely to vote for Trump in the state's May primary. Cruz also is poised to sweep Wyoming's 26 delegates this weekend in a state where Trump's campaign did not seriously compete. In Arkansas, Cruz supporters are exploring ways to topple Trump when delegates are chosen next month. And Sen. Marco Rubio, R-Fla., has refused to release 171 delegates he won when he was in the race, signaling that he may contribute to the anti-Trump push in Cleveland.