Facing intense backlash for walking back his commitment to appear at a scheduled Sept. 10 debate on ABC, former President Donald Trump took to his app Friday night to declare he’s agreed to a new debate — on a different network. “I have agreed with FoxNews to debate Kamala Harris on Wednesday, September 4th,” the MAGA leader wrote late Friday on Truth Social. “The Debate was previously scheduled against Sleepy Joe Biden on ABC, but has been terminated in that Biden will no longer be a participant, and I am in litigation against ABC Network and George Slopadopoulos, thereby creating a conflict …