Through power delegated from the White House to his United States Trade Representative, the POTUS can veto an ITC import ban.
Obama Administration Vetoes Partial Ban on Apple Products - MacRumors
In 2013, knowing they were in real trouble, Apple appealed to the White House instead of letting Federal courts decide its fate. The result was that for the first time since 1987, a President interfered with an ITC decision. People talk about Korea protecting Samsung. The US protects Apple as well.
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Note that the ITC can only ban FOREIGN made imports. So there's another incentive to build devices in America.
Also, IIRC Apple was banned in the first place because they tried to claim patent exhaustion. That is, that they had already paid IP royalties to one company and thus should not pay another. The problem with that, was that such legal protection only exists for chips bought in the USA. To avoid paying taxes, Apple bought their chips outside the USA. Another reason to do more in your native land.