How Donald Trump Jr. and Richard Burr hit an impasse

( CNN) Donald Trump Jr. is balking at answering more questionsabout the June 2016 Trump Tower meetingand the pursuit of a Trump Tower Moscow project, two beginnings familiar with the matter told CNN, placing the stage for a clash with the Republican-led committee amid persuade from both parties over the subpoena to President Donald Trump’s eldest son.

But with Trump Jr. and his allies now mounting a vehement pushback against Burr, the GOP chairman could soon be forced to make a difficult decision if Trump Jr. refuses the subpoena: whether to hold Trump Jr. in contempt and gamble farther GOP backlash or give the President’s eldest son a pass and provoke outcries of favoritism.