New York Sen. Kirsten Gillibrand Kirsten GillibrandSuburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits The Hill's Campaign Report: 19 years since 9/11 | Dem rival to Marjorie Taylor Greene drops out | Collin Peterson faces fight of his career | Court delivers blow to ex-felon voting rights in Florida MORE (D) on Wednesday took aim at President Trump for blasting Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.) in the wake of the city's deadly terrorist attack, saying "this is not who we are."

"This is not who we are. The New Yorkers I know pull together and roll up their sleeves to help in times of tragedy," she tweeted in response to Trump's Twitter attacks against Schumer.

This is not who we are. The New Yorkers I know pull together and roll up their sleeves to help in times of tragedy. https://t.co/kAj9sEFrCs — Kirsten Gillibrand (@SenGillibrand) November 1, 2017

Trump ripped into Schumer earlier in the day, pointing the finger at the Democratic lawmaker for developing the Diversity Visa Lottery program, which allowed the suspect to enter the country.

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"We are fighting hard for Merit Based immigration, no more Democrat Lottery Systems. We must get MUCH tougher (and smarter)," Trump said in a subsequent tweet, while dubbing the program a "Chuck Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE beauty."

Schumer, who helped develop the program in the 1990s, shot back at Trump throughout the day.

"I guess it's not too soon to politicize a tragedy," Schumer tweeted.

Schumer also questioned the president's leadership following the deadly event that killed eight and left nearly a dozen injured.

"President Trump, where is your leadership?" Schumer said on the floor of the upper chamber, while pointing to the differences of dealing with a crisis in the Trump administration compared to the previous Republican administration of President George W. Bush.

"The contrast between President Bush's actions after 9/11 and President Trump's actions this morning could not be starker," he said.

Sayfullo Saipov, who entered the U.S. in 2010, was shot and taken into custody after allegedly driving a truck through pedestrians and bicyclists in lower Manhattan.

He came to this country from Uzbekistan under a program that grants visas to people from countries with few immigrants in the U.S.