It appears Ireland is now added to the E 3 visa status. Congress approved the additional country late last year.....
"This bill expands the E-3 visa program to cover Irish nationals. The E-3 visa is a nonimmigrant visa currently only available to Australian nationals coming to the United States for employment in a specialty occupation. For Irish E-3 initial applications, the Department of State may approve each fiscal year no more than 10,500 minus the number of Australian initial applications approved the previous fiscal year"
See link: w. w. w . congress.gov/bill/116th-congress/house-bill/2877