This is insincere. Scientists have been in policy since the beginning of time. Some of the greatest scientists in early US history were literally politicians. But beyond that policy makers routinely have gone to scientists for recommendations. From where to find fish and gold, to which foods to eat to prevent illness and disease. These predate the US as a country.

The big problem is that when science goes head to head with the "politics" of the day then there are problems. Galileo encountered this, as did even Darwin (he elected to withhold publication to avoid many problems). The end result in the short-term is the scientist is ostracized ... the long-term vindicated.

Now maybe you're asking scientists to do the same today. Don't publish papers or offer recommendations if it will ruffle feathers. I'm sure many scientists do this, but frankly I don't think this is a satisfactory answer.