Is John McCain responsible for Trumpism?

Forgive me please for I have no sources. This is some bs an acquaintance of mine was spouting off today on social media.

She’s been bashing McCain for the past two days after his death shaming those who are praising him. She mentioned that McCain opened Pandora’s Box by having Sarah Palin as a running mate. According to my friend this gave the Tea Party a voice. A voice that has allowed Trumpism today.

My friend shared a source but I can’t find it on her wall. This bitch woman posts 40 times a day. I almost sprained my index finger scrolling to find her post.