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Seven Republican candidates join the second presidential debate, while Donald Trump opts out.
Trump maintains a strong position in the GOP race despite skipping the debate.
Candidates Mike Pence, Tim Scott, Vivek Ramaswamy, and Ron DeSantis face various challenges during the debate.
Trump mocks his rivals during a campaign speech in Michigan, downplaying their aspirations.
Nikki Haley maintains a low profile in the debate, choosing not to engage in interruptions.
GOP candidates unanimously criticize "Bidenomics" as a failing economic approach.
The GOP debate at the Reagan Library underscores the party's changing stances on key issues.