Trying to put the onus onto someone else for your own decisions is really cowardly and kind of dishonest.
Or perhaps it is simply too convenient a PR tool in attempting to place all of the onus on one side.
This has put the onus on them to find a way to get it approved.
1640s, from Latin onus "load, burden," figuratively "tax, expense; trouble, difficulty," from PIE *en-es- "burden" (cf. Sanskrit anah "cart, wagon"). Hence legal Latin onus probandi (1722), literally "burden of proving."