While Trump appeared to take credit for the plan, Intel called the investment an "update" of a 2011 plan to invest USD 5 billion for the same facility in the southeastern US state.
An Intel spokesman said the initial plan had not been completed due to lack of demand, and that Wednesday's move represented a "new" investment of USD 7 billion.
It marked the latest in a string of such announcements since Trump began pressing companies to create more American jobs and reverse the trend of offshore manufacturing.
The company said the Arizona plant would produce "the most advanced 7-nanometer semiconductor chips on the planet" and directly lead to 3,000 "high-tech, high-wage jobs" at Intel.
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With the indirect impact, the company said an estimated 10,000 jobs would result from the factory.
He called the investment a "great thing for Arizona," and added, "it's a lot of jobs."
Krzanich acknowledged that "we've been working on this factory for several years" but "held off actually doing this investment until now."
Asked if the decision came in response to the new president's actions, he said, "It's really in support of the tax and regulatory policies that we see the administration pushing forward that really make it advantageous to do manufacturing in the US."
Intel joined a group of over 120 tech and other firms backing a court challenge to the travel ban -- which is currently suspended.
Tech companies have fiercely opposed the move, saying it would hurt the effort to hire and retain skilled employees from around the world and potentially break up families.
The sector relies heavily on foreign-born scientists and engineers.