Hillary Clinton on Friday announced Virginia Sen. Timothy Kaine as her running mate, going with an experienced politician seen as a strong centrist who could attract independents and possibly disenchanted Republicans -- and most certainly the safe pick.

She announced her pick via text message and on Twitter.

Kaine tweeted that he was "honored" to be her running mate.

The pair was expected to make their first campaign appearance Saturday at a rally in Miami at Florida International University.

Their opponent, Donald Trump, texted supporters several hours after the announcement, "Tim Kaine is Hillary's VP pick. The ultimate insiders - Obama, Hillary and Kaine. Don't let Obama have a 3rd Term."