For weeks now, we’ve seen a steady stream — not just leaks — of information about possible contacts between the Trump campaign and the Russians. This is after the F.B.I. and our intelligence community determined that Russia interfered in the United States election with the aim of electing Donald Trump president.

For the sake of our country, and our democracy, this level of interference calls for a thorough and independent investigation. And that investigation needs to start now.

These malicious attacks were not a momentary cyber intrusion. The attacks were coordinated by a foreign adversary and executed for over a year with devastating results for those of us who were targeted, and ultimately for every American.

The recent spate of revelations shows communications between Trump officials and Russian operatives, conversations between Kremlin officials about their contacts with Trump associates, and information from our allies about meetings between the Trump team and Russian operatives in Europe.