A bill to provide billions of dollars in disaster relief aid stalled in the Senate on Monday after Democrats objected over funding for Puerto Rico.

Senate Republicans, who control the majority, brought up a $13.45 billion measure to help states and territories damaged by hurricanes, wildfires, and other natural disasters, including recent Midwest flooding.

But House and Senate Democrats say it falls short on support for the hurricane-ravaged territory of Puerto Rico, signaling the two chambers will have to work out a compromise to get a bill signed into law, which will stall desperately needed aid.

Senate Finance Committee Chairman Chuck Grassley, R-Iowa, chastised Democrats before the vote, noting many of them are running for president and are making frequent stops in Iowa, where for many residents “everything they own is under water.”

Six Senate Democrats have declared they are running for president, and they voted against the measure.

Grassley dared them in their next campaign trip to the nation’s first caucus state to explain their vote. “How are you going to look Iowans in the eye after voting against moving this disaster relief bill ahead?” Grassley said.

Democrats were unified in opposition to the bill. They said the measure authored by Sen. David Perdue, R-Ga., and others, shortchanges Puerto Rico and other territories ravaged by Hurricanes Maria and Irma in 2017.

The measure does include $600 million in nutrition assistance for Puerto Rico, but Democrats want nearly $1 billion more for the territory, which has struggled to rebuild and repair infrastructure wiped out during the storms.

House Democrats want the Senate to endorse a bill they passed in January that provides $14.17 billion in funding for disaster relief. That measure includes $703 million for nutrition and Medicaid assistance to Puerto Rico, the Northern Mariana Islands, Guam, and American Samoa, and $555 million for social services, mental health, education, and dislocated worker activities.

The House bill also budgeted $2.54 billion for “resiliency funding to mitigate damage from future disasters that are accelerating in number due to climate change.”

It includes no aid to Midwestern states affected by recent flooding.

House Appropriations Committee Chairman Nita Lowey, D-N.Y., and the top Democrat on the Senate Appropriations panel, Patrick Leahy of Vermont, said the Senate bill “does not adequately address the needs of the American citizens of Puerto Rico and other territories.”

Lowey said funding must be added or the measure won’t pass the House.

Senate Democrats accuse the Trump administration of refusing to provide Puerto Rico $20 billion in appropriated funds.

Senate Minority Leader Chuck Schumer, D-N.Y., called the administration’s treatment of Puerto Rico “cruel and nasty.” He urged lawmakers to pass a substitute bill introduced by Democrats that mirrors the House-passed bill. Schumer said the Senate could amend it to include flood aid.

President Trump told Senate Republicans in a closed-door meeting last week he believes Puerto Rico is receiving too much federal aid compared to other states affected by natural disasters.

It received billions of dollars in disaster relief provided by Congress in a package that passed in February 2018.

Prior to the 2017 hurricanes that devastated the island, Puerto Rico was in financial collapse due to mismanagement and was placed under the the authority of a financial oversight and management board in 2016 in a deal that allowed the territory to restructure its massive debt.

Trump tweeted at the Democrats before the vote, urging them to back the measure. “Democrats should stop fighting Sen. David Perdue’s disaster relief bill," he said. "They are blocking funding and relief for our great farmers and rural America!”

Senate Majority Leader Mitch McConnell, R-Ky., said the Senate would not pass the House bill because it does not include money for to help Midwestern states recover from recent flooding and includes policy riders Trump opposes.

He urged senators to pass the bill offered on the Senate floor Monday. “Its our only sure path to making a law with anywhere near the urgency these Americans deserve,” McConnell said.

Senate Appropriations Committee Chairman Richard Shelby, R-Ala., told reporters the two parties will have to work out a compromise that will include the approval of President Trump, who must sign the bill.

Before the vote, Shelby criticized Democrats for demanding more money for Puerto Rico, pointing out that government officials on the island have yet to spend $1.5 billion in Community Block Grant funding.

At the same time, Shelby said, Democrats have not called for any additional funding to help the Midwest following the devastating floods.

“We need to move forward with this disaster package so that those who have thus far received nothing from this Congress; those people in desperate need of assistance, can move on with their lives,” Shelby said.