Rank-and-file House Republicans are urging Speaker Paul Ryan to get behind presumptive GOP presidential nominee Donald Trump, warning his resistance could lead to the party fracturing rather than uniting if he withholds his endorsement. "It makes it harder to unite," said Rep. Raul Labrador, an Idaho Republican and leader within the conservative House Freedom Caucus. House Republicans met with Ryan Wednesday morning for the first time since the speaker told CNN's Jake Tapper he was not yet ready to endorse the presumptive nominee.