Lawmakers on the country's largest American Indian reservation are trying to firm up a meeting with Donald Trump.

Navajo Nation Council spokesman Jared Touchin says Trump's campaign reached out to the office and said the presumptive Republican presidential nominee is open to visiting with tribal lawmakers. Touchin says the tentative date is June 18 off the reservation.

Trump's campaign did not immediately respond to a request for comment Friday.

Navajo lawmakers also extended an invitation to Democrat Hillary Clinton.

Touchin says lawmakers want to hear Trump's stance on coal and other economic development issues. The tribal government relies heavily on coal and coal-fired power plants for revenue but has been under pressure from environmental groups to transition to renewable energy.

About half the workforce on the reservation is unemployed.