Khan, who is Muslim American and whose son Humayun Khan, an Army captain, was killed by a car bomber in Iraq in 2004, spoke out against Trump at the Democratic National Convention. Trump has said Khan had "no right" to go after him. He also suggested that Khan's wife, Ghazala Khan, was not allowed to speak at the convention, a claim she has denied.
Ryan, who has endorsed Trump but disagrees with his proposed ban on Muslims entering the U.S., issued a statement Sunday saying: "Many Muslim Americans have served valiantly in our military, and made the ultimate sacrifice. Captain Khan was one such brave example. His sacrifice — and that of Khizr and Ghazala Khan — should always be honored. Period.”
On one of the campaign web pages Nehlen tweeted, his team writes: "The problem with Paul Ryan is his constant knee-jerk reactions to anything controversial Donald Trump might say without completely understanding the issue."
Ryan spokesman Zack Roday responded to Trump's tweet by saying in a statement: "Rather than engage in a back-and-forth, the Speaker is going to remain focused entirely on ensuring we deliver strong Republican majorities this fall."
Every message Trump posts has the potential to reach a broad national audience: He has more than 10.5 million followers on Twitter.