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In recent years, as norms around presidential powers evolve, the U.S. system of checks and balances has been under tremendous pressure. In this new series, Brookings’ scholars explore how the executive branch is asserting greater authority over the legislative and judicial branches, challenging constitutional principles that date back to the Founders’ time.

The White House, in Washington, DC, US, on Friday, Jan. 24, 2025.
The White House, in Washington, DC, US, on Friday, Jan. 24, 2025. European officials are seeking commitments from the new US administration of President Donald Trump to take part in security guarantees for Ukraine as diplomatic pressure to end the Russian invasion mounts. Photographer: Al Drago/Pool/Sipa USA