After becoming the presumptive Republican nominee, Trump's focus shifted to the general election, urging remaining primary voters to "save [their] vote for the general election." Trump began targeting Hillary Clinton, who became the presumptive Democratic nominee on June 6, 2016 after beating Bernie Sanders in the Democratic primaries, and continued to campaign across the country. Clinton had established a significant lead in national polls over Trump throughout most of 2016. In early July, Clinton's lead narrowed in national polling averages following the FBI's conclusion of its investigation into her ongoing email controversy.