“It appears that General Flynn violated federal law by omitting this trip and these foreign contacts from his security clearance renewal application in 2016 and concealing them from security clearance investigators who interviewed him as part of the background check process,” Reps. Elijah Cummings and Eliot L. Engel, both Democrats, wrote in a letter to Flynn’s attorney obtained by ABC News on Tuesday.

The letter, a copy of which can be read below, highlights new information House investigators collected from executives at three private companies advised by Flynn in 2015 and 2016. The companies were pursuing a joint venture with Russia to bring nuclear power to several Middle Eastern countries and secure the resulting nuclear fuel before Flynn joined then-candidate Donald Trump on the campaign trail.