Yesterday, following a backlash, he scrapped his decision.
On Ukraine, Trump's chief of staff Mick Mulvaney got into a tangle suggesting there was no difference between using pressure to advance national interests and alleged quid pro quos to aid the President's re-election.
Similar shakiness is to the fore with Brexit in Britain, where the process of leaving the European Union looks likely to be delayed yet again.
A new deal was agreed at the 11th hour and British MPs were only given two days before being expected to vote on it. UK media coverage focused as much on the number-crunching for the expected vote as looming implications for Britain and Ireland.
But MPs have put Prime Minister Boris Johnson under a legal obligation to seek an extension. They voted not to approve the deal until related Brexit legislation was passed. From being a question in 2016 of belonging to or quitting the EU, Brexit has escalated to threaten the British union. Polls tend to show that remain is now a more popular option than leave.
And yet there is no certainty that Johnson's deal will be put to a second referendum alongside the option of choosing to stay.
The deal divides the United Kingdom, with England, Wales and Scotland facing a hard Brexit and North Ireland able to stay in the EU customs union. It's not difficult to imagine in 20 years a united Ireland and an independent Scotland with this scenario. There will be regional winners and losers. The Economist reports that within a decade Johnson's deal would have reduced Britain's total trade by about 13 per cent. A new referendum would seem crucial for Britain's democracy. MPs' decision to apply brakes to the Brexit steam train represents a pause for thought.