Comey was the key advocate in this during the Obama years. He spoke for years advocating backdoors... even after Trump took office. Here's an article from March 2017 when he advocated an international backdoor[0]. Here's one in May 2017 when he backed Feinsteins decrypt bill[1].
It receded because Comey was pushed out. And it took a while for Wray to come in and make it an issue again.
It's worth remembering that this is not some faceless government action. They're just people who are lobbying for the change. Remember to contact your representatives regularly to advocate your position on these issues.
0. https://www.techdirt.com/articles/20170327/10121437009/james...
1. https://techcrunch.com/2017/05/03/fbi-director-comey-backs-n...