Possible reason AT&T was not revealing cards in poker game.
Huawei was the target of a lot of political news and pressure back in 2012 to 2016 over alleged stories of National Security concerns - not that it could have been American corporations trying to use political power to protect their markets. Seems it was mostly suspicions and concerns raised by certain congressmen.
Search: Huawei U.S. National Security to see a list of older reports.
T-Mobile opposes Fibertower deal, they are so obvious.
However, Huawei has had a hard road to hoe, but not so elsewhere in the world - such as europe etc. So can we ask ourselves what might have changed? Is it - Trump said he signed off on all sorts of deals during his last trip to China, getting good deals, making jobs, on and on. Ah ha. We will see.