What is the senior advisor to the 2016 Republican nominee for President of the United States currently working as now?
Chief Political Analyst
Title: Donald Trump presidential campaign, 2016
Passage: The 2016 presidential campaign of Donald Trump, an American businessman, television personality, and author, was formally launched on June 16, 2015, at Trump Tower in New York City.  Trump was the Republican nominee for President of the United States in the 2016 election, having won the most state primaries, caucuses, and delegates at the 2016 Republican National Convention.  He chose Mike Pence, the sitting Governor of Indiana, as his vice presidential running mate.  On November 8, 2016, Trump and Pence were elected president and vice president of the United States.
Title: Boris Epshteyn
Passage: Boris Alexandrovich Epshteyn (Russian: Бори́с Алекса́ндрович Эпштейн ; born August 14, 1982) is a Russian-born American Republican political strategist, investment banker, and attorney.  He is currently the Chief Political Analyst at Sinclair Broadcast Group.  He was a senior advisor to Donald Trump's 2016 campaign for President of the United States, and previously worked on the McCain-Palin campaign.  Following Trump's election, he was named director of communications for the Presidential Inaugural Committee, and then assistant communications director for surrogate operations in the administration, until he resigned in March 2017.
Title: Republican Party presidential primaries, 2016
Passage: The 2016 Republican Party presidential primaries and caucuses were a series of electoral contests taking place within all 50 U.S. states, the District of Columbia, and five U.S. territories, occurring between February 1 and June 7.  Sanctioned by the Republican Party, these elections are designed to select the 2,472 delegates to send to the Republican National Convention, who selected the Republican Party's nominee for President of the United States in the 2016 election, Donald Trump.  The delegates also approved the party platform and vice-presidential nominee.
Boris Epshteyn Donald Trump presidential campaign, 2016