What happens if a President or a high power abuses their power?

It takes a majority vote in the house to impeach. Which means to charge them. It takes a 2/3 vote in the senate to remove a president. The senate is the "jury" who convicts him. If impeachment is removal why do they say there have been 2 presidents who have been impeached but none have been removed from office?

They get impeached and notihng is quick in the senate or house,

Impeachment. This requires 2/3 majority to impeach in the senate for the president. Simple majority in the house. Impeaching a Supreme court justice is nearly impossible.

Nothing really happens, as long as it is according to the letter of the law. Presidents have been stretching the executive powers since about Roosevelt I'd say. The executive power has become suffocatingly larger since about then. For example, how come Obama decides when the soldiers go into and leave Iraq and Afghanistan? That's really a power of Congress.