(Mandel Ngan/Pool AFP | 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. 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. The State Department has traditionally discouraged the requirement because of the cumbersome process of posting and discharging a bond and because of a possible misperceptions by the public.