it is a war against China:
1) of ideology. Communist Huawei cannot be allowed to be so successful in business as to eclipse major US corporations. Otherwise the narrative of American democracy and capitalism being superior to and triumphs over Chinese authoritarian system in business development model would be seriously undermined with significant long term impact. America is forcing everyone to take side, while she still has the power to do so. You may argue that this is a short-sighted move, like drinking poison to quench the thirst, but what can Trump do otherwise?
2) of technology. US is really desperate to stop Huawei in its track to be world's number 1 in 5G ( and possibly 6G as well ) technology. America loathes and cannot afford to lose patents, standards, market share, market leadership and future directions, all precious trophies, to China.
I suspect Europe is the main battle ground, in this contest of the will, ideology and financial gains. Europe is suit of caught between 2 lovers, and not quite sure what to do, as reflected by her swinging like a pendulum, between USA and China.