An even more critical moment arrives Monday. The Treasury Department is required to begin imposing sanctions against entities doing business with Russia’s defense and intelligence sectors as well as to produce a hotly-anticipated list of oligarchs maintaining close ties to Putin. Implementing the law robustly would risk harming the relationship Trump has tried to cultivate with Putin — and any delay would mean snubbing Congress’ authority.

Lawmakers in both parties don’t want the White House to drag its feet this time.

“Am I confident” that Trump will meet the deadline? asked Sen. Marco Rubio (R-Fla.). “I’m hopeful.”

The administration “should follow the law as it was passed by Congress,” he added.