Marco Rubio formally denied Monday that he would ever accept a vice-presidential position on Donald Trump's ticket. "While Republican voters have chosen Donald Trump as the presumptive GOP nominee, my previously stated reservations about his campaign and concerns with many of his policies remain unchanged," he wrote on Facebook after speculation suggested he may be tapped for the position. "He will be best served by a running mate and by surrogates who fully embrace his campaign. As such, I have never sought, will not seek and do not want to be considered for Vice President. Instead, I will focus my attention on representing the people of Florida, retaining a conservative majority in the Senate and electing principled conservatives across the country."