Agencies (Qasioun) - A US Republican senator says he will not seek re-election, delivering a fierce attack on President Donald Trump.
Arizona Senator Jeff Flake said "reckless, outrageous and undignified behaviour" at the top of the US government was dangerous to democracy.
Mr Trump has previously called Mr Flake "toxic".
The US president is already embroiled in a row with another Republican Senator, Bob Corker.
In a series of television interviews earlier in the day, Mr Corker accused the president of lying, adding that he debased the US and weakened its global standing.
Mr Trump fired back on Twitter, calling the Tennessee senator a "lightweight" who "couldn't get re-elected".