Sessions was an early supporter of Donald Trump's 2016 presidential campaign; he was nominated by Trump for the post of U. S. Attorney General. He was confirmed and sworn in as Attorney General in February 2017. In his confirmation hearings, Sessions stated under oath that he did not have contact with Russian officials during the 2016 presidential campaign and that he was unaware of any contact between Trump campaign members and Russian officials. However, in March 2017, news reports revealed that Sessions had twice met with Russian ambassador Sergey Kislyak in 2016. Sessions later recused himself from any investigations into Russian interference in the 2016 United States elections. As Attorney General, Sessions rescinded a memo issued by one of his predecessors, Eric Holder, that had sought to curb mass incarceration by avoiding mandatory sentencing for drug crimes; he ordered federal prosecutors to begin seeking the maximum criminal charges possible. A staunch opponent of illegal immigration, Sessions adopted a hard line on sanctuary cities and told reporters that cities failing to comply with federal immigration policy would lose federal funding. Trump issued an executive order revoking the cities' funding, but that order was overturned by a federal court. Sessions also supported Department of Justice prosecutions of medical marijuana providers.