Pence says he won't invoke 25th amendment in letter to Pelosi - as it happened

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2.52am GMT

From me and Joan E Greve:

2.39am GMT

Representative Fred Upton of Michigan has joined three other House Republicans in saying he'll vote to impeach Donald Trump.

Liz Cheney, the third-highest ranking GOP representative has also said she'll vote to impeach. But her colleagues, Freedom Caucus chair Andy Biggs representative Matt Rosendale are calling on Cheney to step down from party leadership. Rosendale, a freshman congressman of Montana said Cheney isweakening our conference at a key moment for personal political gain and is unfit to lead."