President-elect Joe Biden’s promise to stop the construction of more border wall between the United States and Mexico would be a reversal of a Trump administration policy, but the overall effect on U.S. border security is less certain.

Biden vowed in August that “there will not be another foot of wall constructed on my administration.” However, the already-funded projects could leave border security in good shape even if no more wall is built, according to Heritage Foundation’s Vice President of Foreign and Defense Policy Studies James Carafano.