Interior Secretary Ryan Zinke launches a four-day listening tour on Sunday to gather input on whether or not to do away with some of former President Barack Obama's more controversial decisions on expanding national monuments.

The listening tour will begin in Utah at the Bears Ears National Monument and the Grand Staircase-Escalante National Monument in launching the four-day effort, the Interior Department announced Friday.

Both of the monuments are under review as ordered by President Trump's executive order to determine whether to roll back or modify Obama's decisions.

Zinke is tasked to review the decisions and determine if the government had adequately consulted with groups affected by the decisions and how the expansion of monuments discourages public lands use.

Obama made the decision to expand the Bears Ears monument by 1.5 million acres in the waning days of his administration. The large expansion of the monument raised the ire of Utah Republicans, who have since called on President Trump to reverse the decision.

The executive order that Trump signed last month called for review of the largest designations or expansions of monuments in the last two decades.

Zinke is in charge of conducting the review that must provide a recommendation to the White House on whether to rescind, reverse or modify the decisions made over the last 20 years.