Trump and his advisers have repeatedly insisted that the U.S. president can pretty much do whatever he wants and that the pesky Congress need only be consulted rarely.
Trump is threatening to cut Kyiv's U.S. security guarantees ... What is this man talking about? There are no ... commitments from Washington regarding ... security.
The rise of transactional unilateral diplomacy—most visibly associated with U.S. President Donald Trump—has exposed structural vulnerabilities in the alliance system.