受到提议的所有改变都是一项新的边境安全法案的一部分，该法案在众议院通过，但上周在参议院被否决。

All these proposed changes were part of a new border-security bill that passed the House of Representatives but died in the Senate last week.

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但对于代表们，否决一项法案将是史无前例的。

But it would be unprecedented for delegates to reject a bill.

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据美国官方分析，去年一项在参议院被否决的议案，本可以使碳处理价格在2020年降低到每吨30美元。

A bill defeated last year in the Senate would have yielded a carbon price as low as $30 in 2020, according to an official analysis.

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