Biden's efforts to increase the delivery of aid into Gaza will not be sufficient to meet the needs on the ground, according to the letter.
Symptoms of the ailment have included migraines, nausea, memory lapses, and dizziness.
The possibility hasn't been raised by US intelligence, but growing concerns have been voiced on capitol hill.
Tim Walberg also linked Iran and Russia to Hamas's war effort and added, "probably North Korea and China's in there too."
The letter was signed by Rep. Ronny Jackson (R-TX), Rep. Brad Sherman (D-CA), Rep. Guy Reschenthaler (R-PA), Rep. Josh Gotteimer (D-NJ), Rep. Keith Self (R-TX), and others.
Before leaving on yet another recess, the House was thrown into one more crisis when conspiracy theorist and Jewish space laser discoverer Marjorie Taylor Greene tossed one of her trademark bombs.
The congressman, a vocal critic of Israel, made claims in a resurfaced clip from a November protest saying that there is 'no evidence' of Hamas atrocities and Israel using this 'lie.'
The US congresswoman accused Israel of intentionally creating the conditions for famine in the Gaza Strip, saying that the humanitarian crisis had "crossed the threshold of intent."
The bill also forces the UN and other international organizations funded to assess and report on efforts to combat anti-Israel bias and antisemitism and to vet staff for connections to terrorists.
The Defense Appropriations Act provides $500 million of funding for the testing and procurement of the Iron Dome, David's Sling and Arrow.