Sen.Ted Cruz is shifting further from his pledge to support Donald Trump if he wins the GOP nomination as the Texas lawmaker battles increasingly personal attacks and allegations of a sex scandal that he blames on the brash billionaire."I don't make a habit out of supporting people who attack my wife and attack my family, and Donald Trump is not going to be the Republican nominee," Cruz said Friday,reports at the end of a week marked by a bitter feud involvingand a National Enquirer expose of"I want to be crystal clear: These attacks are garbage," Cruz wrote on Facebook about the Enquirer story. "For Donald J. Trump to enlist his friends at the National Enquirer and his political henchmen to do his bidding shows you that there is no low Donald won't go."Trump denied any involvement.A day earlier, Cruz already refused to say if he would support whomever the GOP standard-bearer is, though he'd promised to do so for months,According to the Tribune, Cruz said during a Wisconsin radio interview that aired Thursday that he'd waited until January to actively take on Trump to avoid becoming "roadkill" like other rivals who'd stood up to him.Cruz isn't the only one to be backing off the pledge the GOP had asked of all candidates amid Trump's third-party threats, The Hill reports.In early March, Ohio Gov. John Kasich, Florida Sen. Marco Rubio and Cruz had all reiteratedto back Trump if he won the nomination.But after violence forced the cancellation of a Trump rally, Kasich and Rubio bothabout whether they'd be able to stand by their pledge.