Sen. Ed Markey (D-Mass.) on Tuesday called on Department of Homeland Security (DHS) Secretary Kristi Noem to resign over her response to the catastrophic flooding in Texas that caused a triple-digit death toll.

The Department of Homeland Security secretary defended the federal government's response and denied that policy changes slowed the agency's deployment.

There are questions over why oversight was eased at Mystic Camp as it expanded in a hazardous floodplain, the AP reported.

The first State Flood Plan, published last year, identified $54 billion in flood mitigation, warning and data needs. The state has awarded around $660 million since the plan was published, with a special legislative session coming.

Multiple urban search and rescue teams from across the country that responded to the deadly floods in central Texas told CNN they were not deployed by the Federal Emergency Management Agency until at least Monday evening — days after any victim had been found alive.

The H2i Lab recreated a map of the Kerr County floods, showing how high the water levels got at certain times during the morning of July Fourth.

Over 130 people have died after heavy rain pounded Kerr County, Texas, early Friday, leading to "catastrophic" flooding, the sheriff said.

Many states, including Texas, have not used billions of dollars from FEMA intended to reduce damage from flooding and other disasters