 Complete the following phrase:  In 2016, President Erdogan asked then-Vice-President Joe Biden to remove Preet Bharara, the U.S. attorney for the Southern District of New York who would go on to indict Zarrab. Following continued lobbying by President Erdogan, Donald Trump did fire Bharara in 2017, and eventually replaced him with Geoffrey Berman. In late 2018, President Erdogan personally lobbied President Trump to drop further investigations into Halkbank, once in person during the 