This week's edition of The 45th newsletter.

It's become a cliché to refer to the dizzying US news cycle when rounding up the stories of the week, but last Thursday surely represents one of the most dynamic news days of the Trump presidency. Not least of the big stories of the day was the US military intervention in Syria, with many political analysts quick to assert that Trump had become the latest president to follow the path from isolationist to hawk.

The Republican leader of the House investigation into Russian interference in the US election stepped aside the same day after being criticised for compromising the inquiry. Devin Nunes' sharing of top secret intelligence reports with Trump – but not members of his own committee – had driven the probe to a halt. Nunes said he was stepping aside "temporarily" while he fights House ethics charges that he leaked classified information.

Meanwhile, in the US Senate, Republicans made good on their threat to trigger the so-called "nuclear option" that allowed them to break a Democratic filibuster of Supreme Court nominee Neil Gorsuch; substantially (and controversially) changing the historic rules of the chamber in the process.

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