President Donald Trump whines about Republican challenger -- and blocks him on Twitter

President Donald Trump has apparently "blocked" one of his Republican challengers on Twitter.

On Tuesday, Trump bullied his GOP rivals on Twitter, declaring, "I should be able to take them."

One of the people mentioned by the commander-in-chief was former Rep. Joe Walsh (R-IL).

But Walsh couldn't see it, because he'd been "blocked" by Trump on Twitter.

"Luckily Trump hasn’t blocked my team (yet) or I wouldn’t have known the madman in the White House is taking shots at me," Walsh tweeted.

A federal judge ruled Trump was violating the First Amendment by blocking people on Twitter. That decision was unanimously upheld by a three-judge appeals court panel. But Trump has refused to comply with the court order while appealing.

Walsh vowed a change of policy if he's the next president.

"As President, I’ll never block the American people on Twitter. That’s nuts," he said.