WASHINGTON — Jeb Bush is ready to launch a Republican presidential bid months in the making on Monday by asserting his commitment to the “most vulnerable in our society,” an approach targeting the broader American electorate even as he faces questions about his policies from conservatives in his own party.

Six months after he got the 2016 campaign started by saying he was considering a bid, the 62-year-old former Florida governor will formally enter the race with a speech and rally near his south Florida home at Miami Dade University, an institution selected because it serves a large and diverse student body that’s symbolic of the nation he seeks to lead.

“My core beliefs start with the premise that the most vulnerable in our society should be in the front of the line and not the back,” Bush says in a video featuring women, minorities and a disabled child to be aired at the event before his announcement speech today. “What we need is new leadership that takes conservative principles and applies them so that people can rise up.”

Bush joins the crowded Republican campaign in some ways in a commanding position. The brother of one president and son of another, Bush has likely raised a recording- breaking amount of money to support his candidacy and conceived of a new approach on how to structure his campaign, both aimed at allowing him to make a deep run into the GOP primaries.

But on other measures, early public opinion polls among them, he has yet to break out. While unquestionably one of the top-tier candidates in the GOP race, he is also only one of several in a capable Republican field that does not have a true front-runner.