Sens. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R-Ariz.) and Tammy Baldwin Tammy Suzanne BaldwinKeep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser Democrats seek balance in backing protests, condemning violence MORE (D-Wis.) on Monday called on President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE to make good on his promise to lower drug prices, writing that the problem "is only getting worse."

The Trump administration has yet to take substantive action toward reducing the cost of prescription drugs despite promising to do so several times last year and in his State of the Union address last month.

"We write to urge you to make good on your promise and make fixing the problem of high drug prices a top priority for you and your administration," the senators wrote in a letter to Trump.

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McCain and Baldwin urged the administration to back their bill, which would require drug manufacturers to justify their pricing and provide a breakdown of expenses before increasing the costs of some medicines.

"This will provide taxpayers, consumers and policymakers with more information, including research and development, marketing and advertising costs," the senators wrote.

"Drug companies are making lifesaving treatments unaffordable and are forcing families, seniors, taxpayers and our health care system to continue to foot the bill for these price increases with no systematic transparency. It is clear that the market is broken."

The senators wrote that transparency is a "critical first step" in addressing high drug prices.

"You promised to take on high drug prices as your top priority, so we urge you to call on leadership in Congress to take up and pass our bipartisan legislation," they wrote.