Bob Vander Plaats’ endorsement of Rick Santorum has produced a backlash among conservatives in Iowa, some of whom are accusing the FAMiLY LEADER president of engaging in “pay for play” schemes and selling his coveted support to the highest bidder. Earlier this week, Santorum admitted that Vander Plaats approached the campaign with an indirect solicitation of money to help promote his support, but now other sources familiar with the talks between Vander Plaats and GOP candidates are characterizing the tactics as “corrupt.”

“Clearly the endorsement was for sale — without a doubt,” one source told ABC News’ Shushannah Walshe and Michael Falcone, stressing that Vander Plaats had tried to receive money for his support in past election cycles:

Though Santorum did not specify the dollar amount he and Vander Plaats discussed, multiple sources said he was soliciting as much as $1 million from Santorum and other candidates.