President Donald Trump is striking a combative tone against the Russia probe. He's talking about "Fighting Back" and telling Democrats on the special counsel's team, "wait 'till the Courts get to see your unrevealed Conflicts of Interest!"

Donald Trump tweet

Trump tweeted Monday about Robert Mueller's investigation into possible collusion between the Trump campaign and Russia.

He said: "The 13 Angry Democrats in charge of the Russian Witch Hunt are starting to find out that there is a Court System in place that actually protects people from injustice...and just wait 'till the Courts get to see your unrevealed Conflicts of Interest!"

Trump applauded Friday when a federal judge questioned Mueller's authority in a case against former Trump campaign chairman Paul Manafort.

Mueller is a Republican. Some members of his team contributed to Democrats.