According to CNN, former national security advisor Michael Flynn is worried about his son's legal exposure as Special Counsel Robert Mueller continues to investigate the two men for work they did together at the Flynn Intel Group:
Interviews conducted by special counsel investigators have included questions about the business dealings of Flynn and his son such as their firm's reporting of income from work overseas, two witnesses interviewed by the team told CNN. The Foreign Agents Registration Act (FARA) requires people acting as agents of foreign entities to publicly disclose their relationship with foreign countries or businesses and financial compensation for such work.
[Michael] Flynn Jr., who served as his father's chief of staff and top aide, was actively involved in his father's consulting and lobbying work at their firm, Flynn Intel Group. That included joining his father on overseas trips, such as Moscow in December 2015. During that trip, Flynn dined with Russian President Vladimir Putin at a black-tie gala for the RT television network, which US intelligence views as a Russian propaganda outlet.
CNN notes that protecting his son may factor into how Flynn responds to Mueller's investigation. For his part, Michael Flynn Jr. remains confident on Twitter, posting Sunday:
The SJW are out in full this morning....the disappointment on your faces when I don’t go to jail will be worth all your harassment...
— 🇺🇸MFLYNNJR🇺🇸 (@mflynnJR) November 5, 2017