WASHINGTON (AP) — The National Park Service is exploring whether to require protest organizers to pay for the cost of providing law enforcement and other support services for demonstrations held in the nation’s capital. The proposed rule also could shrink a significant portion of the sidewalk outside the White House that is accessible to pedestrians, leaving a five-foot wide sliver. The public has until the close of Monday to comment on the proposal. More than 7,600 comments have been submitted so far, the vast majority in opposition, including many who consider it an effort by the Trump administration to deter some of the major protests that have marked his presidency. The ACLU’s chapter in Washington says the agency cannot seek to balance its budget on the backs of people exercising their constitutional rights. Close The biggest headlines, delivered to your inbox Get news as it happens. Sign up for Boston.com’s email news alerts. Thanks for signing up!