In blow to GOP unity, Trump refuses to back Ryan, McCain

DAYTONA BEACH, Florida (AP) — Republican presidential nominee Donald Trump said Tuesday that he is refusing to endorse House Speaker Paul Ryan and Sen. John McCain just two weeks after pledging to bring the fractured GOP together at the party's nominating convention.

All three have primary challengers, and all three disapproved of Trump's criticism of the Muslim American parents of an Army captain killed in Iraq.

The billionaire celebrity famous for retaliating when he feels insulted also refused to endorse McCain, a prisoner of war in Vietnam who Trump previously derided for having been captured.

All three chided Trump for engaging in a flap with Khizr and Ghazala Khan, the parents of U.S. Army Capt. Humayun Khan, who was posthumously awarded a Bronze Star and Purple Heart after his death in 2004.

From the podium of the Democratic National Convention, Khizr Khan criticized Trump's position on Muslims and asked whether the real estate mogul had read the Constitution.