An attorney for special counsel Robert Mueller attended Hillary Clinton’s election night party in New York City, The Wall Street Journal reported Friday.

Andrew Weissmann’s attendance at the party is one of many signs pointing to a troubling bias from the attorney. Weissmann has been described by The New York Times as Mueller’s “lieutenant” and “pit bull.”

Conservative watchdog group Judicial Watch obtained an email Tuesday that reveled Weissmann praised former Acting Attorney General Sally Yates’ defiance of Trump.

“I am so proud. And in awe. Thank you so much. All my deepest respects,” Weissmann wrote to Yates on Jan. 30. The email followed Yates’ instruction to the DOJ not to defend an executive order banning immigration from seven nations, an act that led to her dismissal by President Trump.

Weissmann is one of several Democratic donors that have been hired by Mueller, a registered Republican. The special counsel’s “pit bull” donated a combined $6,600 to the Democratic National Committee and the presidential campaigns of Barack Obama and Hillary Clinton.

The special counsel’s probe has been criticized by Trump’s allies, but the White House maintains Trump has no intention to fire Mueller.

White House press secretary Sarah Sanders said in October that Mueller’s investigation would end “soon.”

However, it appears the wide-ranging probe will last into 2018.

“The president’s lawyers are sleepwalking their client into the abyss,” Roger Stone, a Trump confidant, told the Journal.