The administration knows that's their trump card and will keep playing it as long as they can.

政府知道那是他们的王牌，会尽可能长久地使用它。

《柯林斯英汉双解大词典》

The trump card is the Andes mountain range.

王牌是安第斯山脉。

youdao

When his father refused to let him have his own way, the child played his trump card by crying.

看到爸爸没有如自己的意， 那孩子便使出绝招，哇的一声哭了起来。

《新英汉大辞典》

the other is that the only trump card they have is a nuclear fuel and they would like to use that to maximize humanitarian assistance, economic assistance they would like to get,"

VOA: standard.2009.11.04

Kumaratunga's trump card has been to offer the Tamils regional autonomy in the north and east.

CNN: From Our Correspondent: Kumaratunga Under Siege

Whatever Singapore's advantage in management and physical plant, Thailand holds a trump card in its tourist trade.

FORBES: Regions

If Mayweather has a trump card in the "greatest fighter ever" argument, it is his unblemished record.

WSJ: Mayweather's Next Opponent: History