President Barack Obama has pledged more than $195 million in additional humanitarian aid for Syria.
The latest aid package includes funding for food, clothing, household supplies, hygiene kits, and an expansion of emergency medical treatment.
The president timed his announcement to coincide with Eid al-Fitr, the holiday that concluded the Islamic month of Ramadan Wednesday.
The package also includes funding for Syrian refugee camps in Jordan, Egypt, Turkey, Lebanon, and Iraq.
"The United States supports and appreciates the countries hosting nearly 1.9 million refugees who have fled the brutal conflict in Syria and commends host-nation efforts to provide protection, assistance and hospitality to those fleeing violence," the White House said in a statement.
"The United States recognizes the significant strains on host communities and the economic impact of providing refuge to such a large number of people. We call on all host governments to keep their borders open to all those still fleeing violence in Syria," the statement read.
The U.S. has now sent more than $1 billion in humanitarian aid to Syria since the civil war started more than two years ago, making it the world's single largest contributor of humanitarian aid.
The Obama administration has also begun providing weapons to rebel forces in Syria.