By design, it is not easy to get rid of a president. Here are the steps in the process for impeaching a president:

First, an impeachment resolution must be introduced by a member of the House of Representatives.

The speaker of the House must then direct the U.S. House Committee on the Judiciary (or a special committee) to hold a hearing on the resolution to decide whether to put the measure to a vote by the full chamber and when to hold such a vote.

A simple majority of the Judiciary Committee must approve the resolution.

If the Judiciary Committee approves the resolution, it moves to a full vote on the House floor.

If a simple majority of the those present and voting in the House approve an article of impeachment, then the president is impeached.

The procedure then moves to the Senate where a "trial" is held to determine if the president committed a crime. There is no set procedure for the trial. How it is conducted would be set by the Senate leadership.

Members of the House serve as "managers" in the Senate trial. Managers serve a similar role as prosecutors do in a criminal trial, they present evidence during the procedure.

The president would have counsel to represent him at the Senate process.

The chief justice of the U.S. Supreme Court presides over the trial.

Senators listen to the evidence presented, including closing arguments from each side and retire to deliberate.

Senators then reconvene and vote on whether the president is guilty or not guilty of the crimes he is accused of. It takes a two-thirds vote of the Senate to convict. If the president is found guilty, he is removed from office and the vice president is sworn-in as president.

The hearing in the Senate, along with a charge in the House that the president has committed a crime is not a legal one. No penalty, other than removal from office, is brought against a president in an impeachment hearing.

Impeachment trials have been held twice in the country’s history -- for President Andrew Johnson and for President Bill Clinton -- and both ended in acquittals: meaning the presidents were impeached by the House, but not convicted and removed from office by the Senate.

One vote kept Johnson from being convicted of firing the secretary of war in 1868, which went against a tenure act.

In 1999, the Senate was 22 votes shy of convicting Clinton of perjury and obstruction of justice stemming from a sexual harassment lawsuit filed against him by Paula Jones.