Republicans are split on whether President Donald Trump should use military force in Iran to bring about the regime change he has called for.While some Republicans would trust Trump to pull the trigger and stand ready to back him, others urged the administration to use force as a last resort.Across the board, lawmakers said change is coming to Iran one way or the other. Rep. Mark Messmer, R-Ind., believes that with American economic and diplomatic pressure, it’s only a matter of time."It’s going to happen," Messmer said.IRAN REVOLUTIONARY GUARD COMMANDER SAYS REGIME HAS 'FINGER ON THE TRIGGER'...

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