"No product has suffered like this one. But again, what the hell do I know?"
Last month at the President's direction, the Federal Aviation Administration (FAA) ordered the planes pulled from service after the two crashes related to a stabilisation system and faulty sensor readings.
Ethiopian Airlines Flight 302 crashed the morning of March 10 after taking off from Addis Ababa on its way to Nairobi, Kenya, killing all 157 people onboard. Lion Air Flight 610 plunged into the Java Sea in Indonesia in October 2018, killing all its 189 people.
The US government was one of the last in the world to ground the Boeing planes after dozens of other nations banned them amid growing pressure from lawmakers and airline labour unions to suspend flights.
The causes of the crashes are still being investigated, but the focus has been on an automatic safety feature that may have forced the nose of each plane lower when it incorrectly sensed the plane was in danger of going into a stall.
Boeing and the FAA said they are working on an upgrade of the 737 Max software to deal with that safety feature.
Some US airlines have extended flight cancellations into mid-August, with an expectation that the plane will be re-certified to fly before that deadline.
Earlier Monday, first daughter and senior adviser Ivanka Trump paid tribute to the victims of the Ethiopian Air crash during a visit to Addis Ababa.