President Trump donates his entire salary each quarter minus $1 (plus $1 of his own), to fulfill the constitutional compensation requirement:

"The President shall, at stated times, receive for his services, a compensation, which shall neither be increased nor diminished during the period for which he shall have been elected, and he shall not receive within that period any other emolument from the United States, or any of them." - U.S. Constitution, Article Two, Section 1

President Trump donates his entire salary each quarter minus $1, to fulfill the constitutional compensation requirement:

"The President shall, at stated times, receive for his services, a compensation, which shall neither be increased nor diminished during the period for which he shall have been elected, and he shall not receive within that period any other emolument from the United States, or any of them." - U.S. Constitution, Article Two, Section 1

President Trump donates his entire salary each quarter minus $1, to fulfill the constitutional requirement:

"The President shall, at stated times, receive for his services, a compensation, which shall neither be increased nor diminished during the period for which he shall have been elected, and he shall not receive within that period any other emolument from the United States, or any of them." - U.S. Constitution, Article Two, Section 1