The war of words between Donald Trump and Sen. Elizabeth Warren escalated Monday after the presumptive Republican presidential nominee cast Mrs. Warren as a sellout for campaigning with his Democratic counterpart Hillary Clinton.

Mr. Trump said Mrs. Clinton epitomizes much of what Mrs. Warren claims to be battling against.

“As Clinton tries to salvage support among the Bernie Sanders wing of the Democrat Party, Senator Elizabeth Warren has become a turncoat for the causes she supposedly supports,” the Trump campaign said in a statement.

Sharing the stage with Mrs. Clinton Monday during a campaign stop in Ohio, Mrs. Warren took aim at Mr. Trump.

“When Donald Trump says he will ‘Make America Great’ he means make it even greater for rich guys just like Donald Trump,” the Massachusetts Democrat said.

Mr. Trump returned fire in the press release, saying Mrs. Clinton and Mrs. Warren are at odds over the Trans-Pacific Partnership trade deal and saying that Mrs. Clinton has raised tens of millions of dollars from Wall Street donors that Mrs. Warren has assailed.

“Warren’s campaigning for Clinton stands in stark contrast to the liberal ideals she once practiced,” the Trump camp said. “This sad attempt at pandering to the Sanders wing is another example of a typical political calculation by D.C. insiders.”

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