‘Trump is a coward’: Republican says he will challenge president for 2020 nomination

US president’s spokesman says ‘whatever’ as Joe Walsh joins effort to unseat incumbent

Rubio to seek Republican nomination in presidential election

Senator announces White House bid by telling donors he is ‘uniquely qualified’

Tea Party stirs in wake of tax controversy

Leaders of the movement hope outrage over the IRS will rekindle grassroots activism

Heavy hand of the state