Republican Geoff Diehl called on U.S. Sen. Elizabeth Warren Monday to "do right by Massachusetts" by ending her 2018 re-election campaign.

The Whitman state representative, who is running to unseat Warren in the November midterm election, continued to take issue with reports suggesting that the incumbent Democrat will pursue a 2020 White House run.

Diehl, who repeatedly accused Warren of focusing more on the White House than Massachusetts voters, took specific issue with a Washington Post article looking at Warren's campaign activities in other states.

That, he argued, along with a video Warren's campaign released Monday to highlight her "family story" and Native American heritage, show she has no intention of serving her full Senate term if re-elected next month.

"Warren's video shows that she is more focused on her presidential ambitions than being the senator for Massachusetts. Furthermore, the Washington Post article exposed how untruthful she has been with Massachusetts voters: She has put staff in early primary states, created a war room and taken over as the Democratic Party," he said in a statement. "Massachusetts deserves a Senator who puts our state first rather than last."

The Post article contended that Warren has positioned herself "for an all-but-certain 2020 presidential bid" by working to help elect Democrats across the country in the 2018 midterms, including "overtaking some of the traditional duties of Democratic Party campaign committees."

Warren told the newspaper that she is pursuing such efforts outside of Massachusetts because she feels "the urgency of the moment nationally."

"It's two parts: It's holding Donald Trump accountable for what he does. It's also trying to push this country toward working better for hard-working families," she reportedly said.

Warren, who told a Holyoke town hall last month that she would "take a hard look" at a 2020 presidential run after the midterm elections, continued to stoke speculation of a White House bid Monday, as her campaign released the results of a DNA test supporting her claims of Native American ancestry.

In addition to the DNA test results, the Democrat released a video, in which Warren and her family members reflect on their Native American heritage, as well as questions President Donald Trump and other Republicans have raised about it.

The video also stresses that Warren's heritage did not influence her career -- an issue which came to a head in the 2012 U.S. Senate election.

Warren will face off against Diehl and independent candidate Shiva Ayyadurai in the Nov. 6 election.

A University of Massachusetts Lowell-Boston Globe survey released last week found that more than half of registered Massachusetts voters, or 56 percent, would support Warren if the election were held today.

By contrast, about a third, or 31 percent, said they would cast a ballot for Diehl and j ust 8 percent said they would vote for Ayyadurai, according to the poll.