Speaking to reporters in the White House briefing room Thursday afternoon, Homeland Security Advisor Tom Bossert made clear illegal immigrants are not eligible to receive long-term federal disaster relief funds reserved for American citizens after being pressed repeatedly by reporters on the issue. At the same time, Bossert made it clear illegal immigrants should not fear or hesitate in seeking help with shelter, food and water in the aftermath of the Hurricane Harvey. 

From the White House press office bolding is mine): 

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In other words: Illegal immigrants who haven’t committed a crime outside of entering the United States illegally are fine. Food, water and shelter are being offered to everyone, regardless of immigration status. Sweeps are not being done inside shelters. Finally, illegal immigrants are not eligible for long term federal government disaster assistance like the National Flood Insurance Program.