Executive Order April 18, 2017:

“Section 1.  Definitions.  As used in this order:
(a)  “Buy American Laws” means all statutes, regulations, rules, and Executive Orders relating to Federal procurement or Federal grants including those that refer to “Buy America” or “Buy American”  that require, or provide a preference for, the purchase or acquisition of goods, products, or materials produced in the United States, including iron, steel, and manufactured goods.
(b)  “Produced in the United States” means, for iron and steel products, that all manufacturing processes, from the initial melting stage through the application of coatings, occurred in the United States.
(c)  “Petition beneficiaries” means aliens petitioned for by employers to become nonimmigrant visa holders with temporary work authorization under the H-1B visa program.
(d)  “Waivers” means exemptions from or waivers of Buy American Laws, or the procedures and conditions used by an executive department or agency (agency) in granting exemptions from or waivers of Buy American Laws.
(e)  “Workers in the United States” and “United States workers” shall both be defined as provided at section 212(n)(4)(E) of the Immigration and Nationality Act (8 U.S.C. 1182(n)(4)(E))…”

• See also Remarks by President Trump on Buy American, Hire American Executive Order | Kenosha, WI
• Press Gaggle by Principal Deputy Press Secretary Sarah Sanders en route Kenosha, WI, 4/18/2017
• AP – Most H-1B workers are paid less, but it depends on the type of job