Seven senators are calling on President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE to support their legislation that would provide a $1 billion boost for research to create a universal flu vaccine.

Six Democrats and Sen. Angus King Angus KingGovernment watchdog recommends creation of White House cyber director position Democrats step up hardball tactics as Supreme Court fight heats up Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (I-Maine) called the seasonal flu a “pressing public health threat, taking a substantial toll on our families, health care system, and economy each year” in a letter sent to Trump Friday.

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They wrote that they appreciated that Trump has reportedly expressed “strong interest” in the development of a universal vaccine.

In March, philanthropist and Microsoft founder Bill Gates was reportedly talking to Trump in the Oval Office about the idea, according to Stat. Gates said Trump was “super interested” in the notion — so much so that he called Food and Drug Administration Commissioner Scott Gottlieb to ask him about the vaccine while Gates was still in the Oval Office.

Currently, health officials must predict which strains of the flu they believe will be most dangerous each season. But a universal flu vaccine would help fight many different strains.

This year was a particularly rough flu season, resulting in over 160 pediatric deaths. The National Institute of Allergy and Infectious Disease has begun a phase two clinical trial on a potential universal flu vaccine candidate.