'Utterly untruthful' Donald Trump in Twitter war with Republican 'liddle' Bob Corker

Donald Trump has engaged in a furious exchange of tweets and counter-tweets with a Republican senator, saying he "couldn't get elected dog catcher" while the congressman fired back that the president was "utterly untruthful".

"#AlertTheDaycareStaff," tweeted Bob Corker, an outspoken Republican critic of Mr Trump.