Newt Gingrich wants to arrest federal judges if they make the wrong decisions
He's pandering to some of the more vociferous elements of the right. Impeachment is for "treason, bribery, or other high crimes and misdemeanors." Incompetence and having the wrong political views are not a part of the equation.
The original intent of the words "treason, bribery, or other high crimes and misdemeanors" was to take politics out of the equation. I thought Gingrich was a strict constitutionalist. I guess that means he believes in following the original intent strictly when he agrees with that original intent. Otherwise, he'll just ignore it (just as he promises to ignore judicial rulings with which he doesn't agree).