"calling on" is a grammatically correct and usable part of spoken or written English.
It can be used to describe a request or plea for someone to do something, like "The president is calling on Congress to pass the bill."
Exact(60)
But he will not be calling on his allies.
"The ministry of defence is calling on all the reservists.
The outside world now comes calling on Iran.
He said he was calling on national prosecutors for help.
Other participants did not advocate for randomly calling on students.
Breitner is calling on Brazilian football to show similar modesty.
Its consultants can push HP products when calling on customers.
And permit us also to cope the endogeneity in aid calling on alternative set of instruments.
Chris and Betsy were strategic in calling on students they suspected were distracted.
is calling on House Speaker Paul Ryan (R-Wis).
Test the system by calling on cell phone.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com