Robert Mueller’s investigation into Donald Trump’s Russia scandal continues to take him into new territory. For instance, earlier today it was revealed that Mueller is investigating Michael Flynn’s role in an alleged kidnapping plot. But now Mueller’s investigation has breached new territory of a different kind: the United States Congress. There is now confirmation that Mueller is investigating at least one Republican congressman for his ties to the Trump-Russia scandal – and there may be more.

The investigation into the Trump-Russia scandal was always going to eventually lead to Republican congressman Dana Rohrabacher, who has long been knee-deep in ties to Russia. Rohrabacher recently met with fugitive cyberterrorist Julian Assange in an attempt to broker a deal that would’ve been favorable to Russian interests. Rohrabacher has also been accused of being on Vladimir Putin’s payroll by his fellow Republican congressman, Kevin McCarthy. Now NBC News is reporting that Robert Mueller is investigating Rohrabacher for his ties to Michael Flynn during the election.

Based on this new NBC report, we now know for certain that Robert Mueller has expanded his investigation to include at least one Republican congressman who appears to have been conspiring with Russia and the Donald Trump campaign during the election. If Mueller is going after one congressman who appears to be dirty in the Trump-Russia scandal, that means he’s going after them all. So who else is likely to be on his radar?

Senate majority leader Mitch McConnell took millions of dollars from a Kremlin oligarch in 2016, in a move that was only technically legal due to the oligarch’s dual US citizenship. Speaker of the House Paul Ryan verbally panicked when he heard Kevin McCarthy accusing Dana Rohrabacher of being dirty on Russia, in a move that made Ryan sound guilty. Then there are other Republican congressmen who have been trying to cover up the Trump-Russia scandal in suspicious fashion. Is it a coincidence that Bob Goodlatte announced yesterday that he won’t be seeking reelection?