This is from a recent article in The Washington Post covering Trump's failure to praise the deceased John McCain.
As tributes poured in, the president who said McCain was “not a war hero” spent much of Sunday at his golf course in Virginia and did not utter a word publicly.
source: https://www.washingtonpost.com/politics/trump-rejected-plans-for-a-white-house-statement-praising-mccain/2018/08/26/0d0478e4-a967-11e8-8f4b-aee063e14538_story.html
What does 'as tributes poured in' mean?
Does it mean: As the President could feel the consequences of his action/inaction with a growing number of people criticizing him, he ... ?
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"As tributes poured in" here means "While many people were saying respectful things about John McCain..."