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Matias J. Ocner, Miami Herald via Associated Press
FILE - In this Saturday, Oct. 21, 2017, file photo, Myeshia Johnson kisses the casket of her husband, Sgt. La David Johnson during his burial service at Fred Hunter's Hollywood Memorial Gardens in Hollywood, Fla. Myeshia Johnson told ABC's "Good Morning America" on Monday, Oct. 23, 2017, that she has nothing to say to the president, adding that his phone call to her made "me cry even worse."

WASHINGTON — The American people and the fallen soldiers' families deserve answers about a deadly ambush in the African nation of Niger, the top U.S. general said Monday, without being able to provide many himself.

Three weeks after the attack by presumed Islamic State forces, Marine Corps Gen. Joseph Dunford, the Joint Chiefs of Staff chairman, said several matters must still be resolved. They include whether the U.S. had adequate intelligence and equipment for its operation, whether there a planning failure and why it took so long to recover one the bodies.

Dunford said the four U.S. soldiers died after a battle that started on Oct. 4 in a "complex situation," leading to a "difficult firefight." At a Pentagon news conference, he tried to outline what the military knows.

He said a group of 12 American forces accompanied 30 Nigerien forces to an area about 85 kilometers north of the capital on Oct. 3. When they sought the next day to return, they encountered about 50 enemy fighters traveling by vehicle, carrying small arms and rocket-propelled grenade launchers.

Within an hour of taking fire, the team requested support. Within another hour, a remote plane flew above. Later, French jets arrived and ferried wounded Americans to safety. The bodies of three American killed in the fighting were transported out of the battle scene, but one — Sgt. La David Johnson — wasn't recovered until Oct. 6.

Independent of the military's investigation, the Johnson's ordeal has become a major political dispute in the United States after President Donald Trump credited himself with doing more to honor the dead and console families than any of his predecessors.

Then, Johnson's aunt said Trump showed "disrespect" to his family as he telephoned to extend condolences. In an extraordinary White House briefing, John Kelly, the former Marine general who is Trump's chief of staff, shot back at Trump's critics, and the president continued the criticism over the weekend.

Members of Congress are demanding answers almost three weeks after the ambush in a remote corner of Niger, where few Americans travel. Last week, Sen. John McCain, the Republican chairman of the Armed Services Committee, even threatened a subpoena to accelerate the flow of information from the administration.

Dunford defended the broader American mission in Niger. He said U.S. forces have been in the country intermittently for more than two decades. Currently, some 800 U.S. service members are supporting a French-led mission to defeat the Islamic State, al-Qaida and Boko Haram in West Africa.