Leading Senate Democrats want to know why the Trump administration allowed a top Russian spy onto U.S. soil.

Minority Leader Charles E. Schumer led other Democrats in raising concerns Tuesday about a reported visit by Sergey Naryshkin, Russia’s foreign spy chief and an ally of President Vladimir Putin.

“The Trump administration must immediately come clean and answer questions: Which U.S. officials did he meet with? Did any White House or National Security Council official meet with Naryshkin? What did they discuss?” Schumer said.

“Surely he didn’t come alone, so which other sanctioned Russian intelligence agency figures did the Trump administration let into our country?” the New York Democrat continued. “And most importantly, is his visit why the Trump administration decided to forego sanctions?”

The sanctions Schumer referred to are related to a law that passed the Senate 97-2 last year. Democrats contend the law required the Trump administration to move forward on new sanctions related to Russia by Monday.