Sen. Bernie Sanders Bernie SandersNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts The Memo: 2020 is all about winning Florida MORE (I-Vt.) criticized President Trump Donald John TrumpTrump says he doesn't think he could've done more to stop virus spread Conservative activist Lauren Witzke wins GOP Senate primary in Delaware Trump defends claim coronavirus will disappear, citing 'herd mentality' MORE’s decision to invite families of people killed by undocumented immigrants to Tuesday night's address to a joint session of Congress.

“The murder of anyone is a tragedy, and our hearts go out to all families who lose a loved one to violence," Sanders wrote in a post on Facebook two hours before Trump was set to speak.

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"But let’s be clear about what Donald Trump is doing tonight in inviting family members who saw a loved one murdered by an undocumented immigrant."

Two of Trump's guests, Jessica Davis and Susan Oliver, are the widows of California police officers who were shot in 2014 by a convicted felon who had previously been deported to Mexico, according to the Los Angeles Times. The third guest, Jamiel Shaw Sr., is the father of a teen killed by a gang member who was in the U.S. illegally.

Sanders questioned why Trump did not invite the families of Srinivas Kuchibhotla, the Indian immigrant who was killed in Kansas last week, or the families of the black parishioners killed in Charleston, S.C., in 2015.

Sanders' Facebook post linked to a report by ABC on the president and Melania Trump’s invitation to the widows.

"He is stirring up fear and hatred against immigrants and trying to divide our nation," Sanders continued. "That is his political strategy and we must not allow him to get away with it."

"Trump, any murder is a tragedy. Don't use these tragedies to stir up divisions by race and nationality."