Energy Secretary Steven Chu made no apologies Thursday for the $535 million loan guarantee the government made to now bankrupt solar panel maker Solyndra, saying the company’s collapse was unforeseeable and politics did not play a role in the approval process.

Chu defended the administration at a hearing on Capitol Hill against republican attacks that the Obama administration awarded the loan guarantee because one of the company’s main investors was a major fundraiser for Obama’s presidential campaign in 2008.

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