Congress has subpoenaed former White House Counsel, Don McGahn, to testify, and President Donald Trump has vowed to “fight all the subpoenas.�.
Source: Is Trump Invoking Executive Privilege Or Not?
Is Trump Invoking Executive Privilege Or Not?

Congress has subpoenaed former White House Counsel, Don McGahn, to testify, and President Donald Trump has vowed to “fight all the subpoenas.�.
Source: Is Trump Invoking Executive Privilege Or Not?