US President Donald Trump on Wednesday signed [press release] legislation imposing new sanctions against Russia and limiting the president’s ability to ease existing sanctions.

The legislation [HR 3364 materials] also imposes sanctions against North Korea and Iran.

In a statement [press release], Trump said that while he supports “tough measures to punish and deter aggressive and destabilizing behavior … this legislation is significantly flawed.”

A separate White House statement criticized the legislation for limiting the president’s authority:

Still, the bill remains seriously flawed—particularly because it encroaches on the executive branch’s authority to negotiate. Congress could not even negotiate a healthcare bill after seven years of talking. By limiting the Executive’s flexibility, this bill makes it harder for the United States to strike good deals for the American people, and will drive China, Russia, and North Korea much closer together. The Framers of our Constitution put foreign affairs in the hands of the President. This bill will prove the wisdom of that choice. White House press release

Both the US House of Representatives and Senate [JURIST reports] voted overwhelmingly in favor of the sanctions last week. Moscow responded [JURIST report] over the weekend by ordering the US to reduce its number of diplomats in the country to 455 and evacuate two buildings used by the embassy.