President Joe Biden has announced a major disaster in Texas, clearing the way for more federal funds to be spent on relief efforts in the US state.
Power is returning across Texas and temperatures are set to rise but some 13 million people are still facing difficulties accessing clean water.
Mr Biden has said he will visit Texas as long as his presence is not a burden on relief efforts.
Nearly 60 deaths have been attributed to cold weather across the US.
President Biden said he had ordered federal assistance to supplement state and local recovery efforts in the areas affected by severe winter storms.