From the BBC:
Former US presidential candidate George McGovern says the case for impeaching President Bush is "far stronger" than it was against Richard Nixon.
Mr McGovern lost the 1972 presidential election to Nixon, who resigned in 1974 amid the Watergate scandal.
George W Bush is guilty of "numerous impeachable offences", Mr McGovern writes in a Washington Post article.
These include, he says, the Iraq war, the Guantanamo detentions and the neglect of Hurricane Katrina's victims.
"As we enter the eighth year of the Bush-Cheney administration, I have belatedly and painfully concluded that the only honourable course for me is to urge the impeachment of the president and the vice-president," reads the start of Mr McGovern's article.
He stood clear of calls to impeach Nixon, Mr McGovern writes, fearing that it would be seen as an expression of personal vengeance towards the man who had beaten him in the 1972 election.
But now, Mr McGovern says, his choice is different.
President Bush and Vice-President Cheney "have repeatedly violated the Constitution. They have transgressed national and international law. They have lied to the American people time after time".
The case against them is far stronger than the case against Nixon and Vice-President Spiro Agnew, he writes.
Mr McGovern lists a series of events and issues to support his call for impeachment.
Read the rest here.