The U.S. risks losing its pristine triple-A credit rating later this year if the government shutdown persists and negatively impacts the country’s debt ceiling, Fitch said Wednesday.

The shutdown entered day 19 as a stalemate between President Donald Trump and congressional Democrats over a spending package to fund nine government agencies continues. Lawmakers and the White House are divided over the president’s demand for money for a border wall, a case he took to prime time television Tuesday night, stopping short of declaring an emergency as analysts had speculated.