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Texas Senator Ted Cruz has a double digit advantage over Donald Trump in Wisconsin, less than a week before that state's primary. Party bosses meantime are trying to ensure a united front after the voting.

FOX's Jared Halpern has more from Washington:

The Republican frontrunner spent yesterday here in D.C.

Donald Trump meeting with national security advisers and a sitdown with Republican National Committee chairman Reince Preibus: 

(Trump) "It's really a unity meeting. We're leading by a lot. We have far and away the most delegates. Millions and millions of votes more than anybody else."

But the meeting comes as Trump and his Republican competitors have backed away from a pledge to support whoever wins the nomination and a growing possibility no candidate secures 1,237 delegates before the July convention.

In Washington, Jared Halpern, FOX News.