WASHINGTON — The Obama administration told members of Congress on Tuesday that it was canceling all White House tours beginning on Saturday because of the $85 billion in across-the-board spending cuts that went into effect last week.

Constituents who want to visit the White House must go through their representatives to schedule a tour, so Congressional offices will be forced to turn away visitors hoping for a tour and contact others to cancel scheduled tours.

Lawmakers are being forced to trim their budgets, too. On Monday, Representative Candice Miller, Republican of Michigan and chairwoman of the House Administration Committee, told members that their 2013 office budget authorizations were being reduced by 8.2 percent.

“Although sequestration isn’t the ideal way to reduce government spending,” Ms. Miller said in a statement, “it is now the law, and Congress is not, and should not be, immune.”