In their final debate before Tuesday's election, Sen. Elizabeth Warren and GOP challenger State Rep. Geoff Diehl clashed over provocative political rhetoric, gun laws and President Trump's assertion that he can end birthright citizenship with the stroke of his pen.

"That's in the Constitution," Warren said, responding to a question about Trump's intention to issue an executive order to end automatic citizenship for children born to parents in the country illegally. "The president can't end it by himself. So, no I don't agree with the president. He doesn't get to erase parts of the Constitution that he doesn't like."

After the debate, Diehl said Trump is starting a conversation about changing the natural birthright rules, and that he'd support an executive order ending the practice whether or not a court upholds it.

"It's not meant for people who have not taken the initiative to become a U.S. citizen that their children should not be considered automatically U.S. citizens," Diehl told reporters.

Diehl criticized Warren for her admission that she'll "take a look" at running against Trump in 2020 instead of serving a full second term in the Senate.

"Ironically, my opponent and President Trump do have something in common: neither wants to be senator from Massachusetts, but both want to be president," Diehl said.

Warren says she's merely been transparent about possible White House ambitions.

"But I guarantee you this," Warren added, "no matter what I do I will work for the people of the Commonwealth of Massachusetts."

When asked whether heated political rhetoric from Trump and others contributes to political violence such as the recent synagogue shooting in Pittsburgh, Diehl said Warren and other Democrats use language just as charged as Republicans.

"That's the kind of rhetoric and dialogue that pushes people in the wrong way. It was a Cambridge supporter of hers who put a $500 bounty on an ICE officer. That's the kind of rhetoric we don't need encouraging this awful, awful tragedies that we have to deal with now," Diehl said.

Diehl pushed the idea that the federal government should adopt a system of national gun licensing, letting licenced gun owners from other states carry firearms in Massachusetts. Diehl said establishing national standards would help expand Massachusetts's tight regulations to the rest of the country.

"We need to make sure other states come into compliance. With Sen. Warren, you will have no seat at the table based on the fact that she is unable to work with the administration and with a Republican controlled Senate," Diehl.

In closing remarks, Warren said she hopes the people of Massachusetts send her back to Washington to keep fighting.

Diehl characterized the election as a choice between "integrity or hypocrisy" and railed against Warren's political demeanor and ambitions. "She doesn't even want this job. But I do," Diehl said.