Yeah he actually said it over the phone during an interview with Sean Hannity. I can’t find the sound bite, but here is the article published on 4/23/21. It’s about halfway down the article:
https://www.deseret.com/2021/4/23/22399234/former-president-donald-trump-americans-coronavirus-vaccine-obama-bush-clinton-carter

Edit: here’s the video, time stamp 3:30:

https://nypost.com/2021/04/19/trumps-urges-americans-to-get-vaccines-takes-shot-at-jj-pause/

Yeah he actually said it over the phone during an interview with Sean Hannity. I can’t find the sound bite, but here is the article published on 4/23/21. It’s about halfway down the article:
https://www.deseret.com/2021/4/23/22399234/former-president-donald-trump-americans-coronavirus-vaccine-obama-bush-clinton-carter