Trump negotiated with terrorists, while excluding the democratically elected government of Afghanistan.
Trump released thousands of Taliban fighters.
Trump closed bases and airbases in Afghanistan and drew down the forces to a level that could never defend themselves if push came to shove.
He then left office with Biden holding the bag. Biden had no choice but have his people gtfo. Because the Taliban outnumbered the US troops and there was no air support possible any more. The Taliban would have massacred the remaining Americans.