A group of Senate Democrats, including several 2020 contenders, have introduced legislation that would prevent President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE from using disaster relief funds to finance a wall along the southern border.

The Protecting Disaster Relief Funds Act would block Trump from taking funds allocated to the Department of Homeland Security, the Department of Housing and Urban Development or the Army Corps of Engineers for disaster relief and using that money to construct physical barriers along the U.S.-Mexico border.

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The senators backing the bill include several who have already entered the presidential race — Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (D-Mass.), Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.) and Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) — as well as Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), who is reportedly on the verge of making his announcement.

Harris said in a statement announcing the legislation that Trump "cannot go around Congress to fund his ridiculous vanity project."

"I'm proud to introduce this bill today to ensure that funds intended for victims of natural disasters do not go towards a wall that Congress won't fund and people on the border don't even want," she added. "This bill will stand up for Congress' power of the purse and help California families affected by recent natural disasters begin the process of recovery."

Trump on Friday declared a national emergency at the southern border in an effort to circumvent Congress and spend billions on barriers along the border.

It's unclear where those funds will come from, but the White House has left open the possibility that he could use disaster funds for the project, according to The Associated Press.