WASHINGTON ( IOWA CAPITAL DISPATCH ) - President Donald Trump and Iowa Republican Sen. Chuck Grassley are sparring on social media over whether the Judiciary Committee chairman should abandon a century-old tradition that allows senators to block the advancement of judicial nominees who would serve in the senators’ home states.

The practice, referred to as “blue slips,” has irked Trump, who has had some of his picks for the federal bench opposed by Democratic senators.

Trump posted on social media over the weekend that he wanted GOP Senate leaders to move his judicial nominees through, regardless of the level of opposition from Democrats, and said Monday he would sue over the practice, which he called “unconstitutional.”

“We’re also going to be filing a lawsuit on blue slipping,” he sa

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