That night（时间状语）, senators （主语）flew （谓语动词）back to Washington （介词短语作方向状语）from as far away as Hawaii （介词短语作来源状语）for emergency talks （介词短语作目的状语）aimed at finding a compromise （过去分词作定语）on Trump’s demand （介词短语作定语）for nearly $6bn for a wall （介词短语作定语）on the southern border（介词短语作定语）, a campaign promise （同位语）which has become an obsession（定语从句）.

【注】所有的“介词短语作定语”，都是修饰前文紧挨着的词语。