Impeachment is only for criminal behavior and even at that it has to be passed by both the House and Senate in a majority vote. Actually, the President (and any other Feder
…al official), and be impeached for "high crimes and misdemeanors". Sadly, nowhere in Constitution or associated writings of the Founders does there exist a solid definition as to what that phrase means. We just don't know. As such, Congress gets to make up its mind as to what is an impeachable offense. In the case of Presidents, the three existing serious attempts to impeach a sitting President (Andrew Johnson, Andrew Jackson, and Bill Clinton), all three were really politically motivated, with little that could be considered a legal crime behind them. In the case of Impeachment of various Judges, however, Congress has a much better track record - all impeachments to date of sitting judges have come as a result of either a criminal conviction, or an impending criminal conviction of a serious crime (several for bribery, several for judicial malfeasance, and the like). So, yes, it is entirely possible for a President to be impeached for gross incompetence. Getting the Senate to agree that this is an offense worthy of removal of the President is a more difficult proposition, however. (Remember that impeachment merely accuses the President, while the Senate conducts a trial to see whether or not the "crimes" named in the impeachment warrant removal from office.) (MORE) 
