By Steve Holland WASHINGTON (Reuters) - Backers of Republican presidential candidate Jeb Bush are going on the attack against rivals Donald Trump, Ted Cruz and Marco Rubio in a new TV ad that will be broadcast in early voting states. Hours after New York billionaire Trump proposed a ban on Muslims entering the United States, Bush's SuperPAC, Right to Rise, released an ad that ridiculed Trump as "impulsive and reckless." The aim of the advertisement is to portray former Florida Governor Bush as ready to take on the job as commander-in-chief and dismiss some of his chief rivals as ill-prepared for the White House. Texas Senator Cruz is criticized in the ad for voting in the Senate against a bill that limits the government’s ability to collect and monitor Americans' cell phone data.



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