According to Politico, EPA Administrator Scott Pruitt will testify before the House Appropriations Interior-EPA subcommittee on Thursday, June 15 at 1 p.m. The Committee's website confirms this here.
According to Politico, "appropriators have already indicated they will not cut away EPA's budget as severely as the White House's proposal, particularly on state grants and popular programs cleaning up the Great Lakes, the Chesapeake Bay and other regions."
Of course, even if the cuts are half as bad as what is proposed, a 15% cut could be devastating to EPA's programs, personnel, and ultimately environmental protection.