The appearance renewed questions about the politicization of the military in the run up to November's presidential election.
Macgregor believes that Israel must have defensible borders and that President Trump’s decision to move the US Embassy to Jerusalem was long overdue
The incident caused no casualties, the military said.
It was not immediately clear if there were any US troops in the convoy or if anyone had been injured in the explosion
US Army General and Chairman of the Joint Chiefs of Staff Gen. Mark Milley's visit comes amid a rise in tensions between Israel, the US, and the Islamic Republic.
“The President of the United States attempted to force LTC Vindman to choose: Between adhering to the law or pleasing a President.”
"Nobody briefed or told me, or Vice President Mike Pence, or Chief of Staff Mark Meadows about the so-called attacks on our troops in Afghanistan by Russians."
A Russian military intelligence unit linked to assassination attempts in Europe had offered rewards for successful attacks last year.
President Donald Trump has ordered the US military to remove 9,500 troops from Germany.
David Schenker, assistant secretary of Near Eastern Affairs, did not give details about the threat, but told reporters in a teleconference: "It continues to be significant."