Opponents of Donald Trump are pushing for a rules change that would deprive the presumptive Republican presidential nominee of the power to choose the vice presidential candidate at the Republican National Convention, according to a new report.

"The preference of any candidate seeking nomination for president of the United States shall have no bearing upon the submission of names for nomination for vice president of the United States nor the recording of votes for the same," says a draft rule obtained by Buzzfeed.

Trump hasn't named a running mate, and some of his reported potential candidates have withdrawn themselves from consideration. Presidential tickets have united rivals many times, but such a rule change would have echoes of the earliest presidential campaigns, such as when political archenemies Thomas Jefferson and Aaron Burr served as president and vice president, respectively.

"It's a counterweight to Trump," a Free the Delegates source told Buzzfeed. "It's the grassroots saying if you're going to do this, you're going to do it with our pick."

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