The Republican and Democratic presidential candidates collided sharply Tuesday in the wake of the deadly terrorist attacks in Brussels, with GOP hopeful Ted Cruz calling on law enforcement to “patrol and secure Muslim neighborhoods” and his Democratic rivals sternly rebuking him. The uproar highlighted the deepening rift between Republicans and Democrats on an issue that was poised to gain a fresh foothold in the campaign: the treatment of Muslim Americans amid concerns about terrorism. Democratic presidential front-runner Hillary Clinton tweeted that Cruz’s proposal was “beneath us” while Vermont Sen.