Vice-president elect Mike Pence is preparing to become the top liaison between President-elect Trump and Congress, a role that many lawmakers see as critical, and one that will require Pence to do everything from negotiating his directives in the House and Senate to interpreting Trump’s tweets.

“I think Pence is going to have a very big role,” Senate Republican Conference Committee Chairman John Thune, R-S.D., told the Washington Examiner after meeting privately with him on Wednesday.