WASHINGTON (AP) — Average premiums for individually purchased health insurance will grow around 15 percent next year, largely because of marketplace nervousness over whether President Donald Trump will block federal subsidies to insurers, Congress' nonpartisan fiscal analyst projected Thursday.

The Congressional Budget Office estimate comes as Trump has repeatedly threatened to halt the payments in his drive to dismember President Barack Obama's health care law.

The agency said 2018 premiums will grow "largely because of short-term market uncertainty — in particular, insurers' uncertainty abou...