The claim is mostly true because Rep. Don Bacon has publicly stated he would lean toward supporting impeachment if President Trump ordered a military invasion of Greenland, and he indicated there are enough Republicans willing to back such an impeachment, though the exact number and certainty of votes remain somewhat speculative.
Rep. Don Bacon (R-NE) confirmed to multiple news outlets that Republicans have finally drawn a line. If Trump invades Greenland, there are enough Republicans willing to impeach him.

Republican says he would ‘lean toward’ impeaching Trump if he invades Greenland - The Independent
Source: independent.co.uk
Key Evidence
Rep. Don Bacon told multiple outlets he would 'lean toward' impeaching Trump if he invaded Greenland.
independent.co.ukindependent.co.ukRepublican says he would ‘lean toward’ impeaching Trump if he invades Greenland
thehill.comthehill.comBacon says he would ‘lean’ toward Trump impeachment if Greenland invaded: ‘Utter...+1 more
Bacon indicated there are enough Republican votes in the House to impeach Trump under this scenario.
meidasnews.commeidasnews.comRepublican Rep. Says Votes Exist to Impeach Trump if He Invades Greenland
tucson.comtucson.comHouse Republican says Trump could be impeached if US invades Greenland
Multiple reputable news organizations reported on Bacon's statements in early January 2026.
dailysignal.comdailysignal.comGOP Rep Says Some Republicans Will Back Impeachment If Trump Invades Greenland...
newsweek.comnewsweek.comRepublican Signals Support for Trump Impeachment
What the Evidence Shows
Multiple independent news sources report that Rep. Don Bacon, a Republican from Nebraska, has expressed that he would consider or lean toward impeaching President Donald Trump if the U.S. Were to invade Greenland by force.
Bacon described such an action as extreme and potentially presidency-ending. He also suggested that there is sufficient Republican support in the House to carry out an impeachment vote under those circumstances.
However, while Bacon's statements indicate a significant faction of Republicans might support impeachment in this hypothetical scenario, no formal vote or definitive count of Republican votes has been established publicly. The language used by Bacon is cautious (e.g., 'lean toward,' 'could back'), reflecting some uncertainty rather than an absolute guarantee.
Therefore, the core claim that Republicans have 'finally drawn a line' and would impeach Trump if he invades Greenland aligns with Bacon's statements but should be understood as conditional and based on his perspective rather than a confirmed House consensus.