[Idiom] step into the breech

[akit]

I encountered the phrase "step into the breech" in an article about the recent resignation of the White House Chief of Staff. What does "step into the breech" mean?

Into the breech steps Rouse, an Obama senior adviser known around the White House as a problem-fixing, media-shy strategist and organizer.
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Thank you in advance!

 

[Raymott]

I encountered the phrase "step into the breech" in an article about the recent resignation of the White House Chief of Staff. What does "step into the breech" mean?

Into the breech steps Rouse, an Obama senior adviser known around the White House as a problem-fixing, media-shy strategist and organizer.
​

Thank you in advance!

It's an apparently common error for "step into the breach":
step into the breach - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.

If you were an obstetrician, you might step into the breech.