Sen. Orrin Hatch (R-Utah) on Monday sent President Barack Obama a letter criticizing the new health care law, charging that it will result in millions of Americans losing coverage.

Earlier Monday, Health and Human Services Secretary Kathleen Sebelius pushed back against similar accusations: She argued that Americans who want to keep their current coverage will be able to do so. The health care law gives HHS the responsibility of writing new health care regulations.

“The impact of your Administration’s new regulations governing the treatment of existing health plans is deeply disturbing. As a direct result of these new rules, 87 million Americans — or 51 percent of those with employer-provided health care — will be forced out of their current coverage, with small businesses being the most adversely impacted,” Hatch wrote. “Unfortunately, your health care promises are inconsistent with this law. It will be hard-working Utahns and Americans who will continue to suffer from rising health care costs, a loss of their current coverage choices, and hundreds of billions in new job-killing taxes.”

Sebelius countered that Americans can keep their current health insurance plans, if they are happy with them.

“The bottom line is that under the Affordable Care Act, if you like your doctor and plan, you can keep them,” Sebelius wrote in a White House blog post. “But if you aren’t satisfied with your insurance options today, the Affordable Care Act provides for better, more affordable health care choices through new consumer protections. And beginning in 2014, it creates health insurance exchanges that will offer individuals and small businesses better, more affordable choices.”