Openness toward Warren may signal a change from just three years ago, when powerful Democrats in the financial industry sought to block her potential rise to the White House. In mid-2016, a dozen major donors from Wall Street warned in interviews with Politico that they wouldn’t give money to Hillary Clinton’s presidential campaign if she chose Warren as her running mate. Donors feared Warren would push Clinton too far to the left and harm the economy. Clinton ended up selecting Virginia Senator Tim Kaine. They lost to Trump.

Wall Streeters’ views have proven adaptable over the years. Some like to think of themselves as savvy investors in politics, able to bet early on the next big thing. At least a few prominent financiers are known to trade stories about how early they backed then-Senator Obama in the 2008 presidential race. Sometimes support is a calculated move. Even donors who backed Clinton later gave to Trump’s inauguration.

Yet Warren’s criticism of the industry has at times flared into direct clashes with its most prominent leaders. Her book “A Fighting Chance” describes a heated discussion about regulation with JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon during an encounter in 2013: “We weren’t quite shouting, but we were definitely raising our voices.”

‘I Understand’

Dimon later echoed the views of many in finance at an industry event in 2015: “I don’t know if she fully understands the global banking system.”

Warren shot back: “The problem for these guys is that I fully understand the system and I understand how they make their money, and that’s what they don’t like about me.”

Despite that exchange, Dimon and Warren have met a few times and the visits went well, according to a person with knowledge of the talks who asked not to be identified describing private meetings. In recent years, Dimon has also expressed concerns about many of the same issues Warren prioritizes, such as income inequality, stagnant wages and soaring health-care costs.

Yet there’s no truce: Last week, she took aim at JPMorgan for reviving a policy pushing credit-card customers to use arbitration to resolve disputes. In a letter, she urged the bank to “reconsider your plans to resume exploiting its customers.”

Wells Fargo

Warren has no plans to ease off the industry. “Nobody has been tougher on Wall Street than Elizabeth -- and no one will be tougher on Wall Street as president than Elizabeth will be,” the campaign said in an emailed statement. “She wants to break up the big banks.”