WASHINGTON (AP) — The State Department is proposing requiring applicants for business and tourist visas to post a bond of up to $15,000 to enter the United States, a move that may make the process unaffordable for many.

In a notice to be published in the Federal Register on Tuesday, the department said it would start a 12-month pilot program under which people from countries deemed to have high overstay rates and deficient internal document security controls could be required to post bonds of $5,000, $10,000 or $15,000 when they apply for a visa.

The proposal comes as the Trump administration is tightening requirements for visa applicants. Last week, the State Department announced that many visa renewal applicants would have to submit to an additional in-person interview, something that was not required in the past. In addition, the department is proposing that applicants for the Visa Diversity Lottery program have valid passports from their country of citizenship.