Top scientific and research groups want to probe where the presidential candidates stand on the pressing scientific issues facing the country, including climate change and vaccines.

A collection of more than 50 groups sent a questionnaire to the campaigns of Democrat Hillary Clinton, Republican Donald Trump and third-party candidates Libertarian Gary Johnson and Green Party nominee Jill Stein on Wednesday. The goal is to get the 2016 campaign talking about major issues in science, engineering and health, the groups said.