I mailed my return March 9,2020. Is the IRS in shutdown mode? There is no response from them via online, phone, etc. Should I call my US Senator's office?

[DoninGA]

The IRS is not processing any paper tax returns at this time.

Go to this IRS website for information - https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue

The IRS is not currently able to process individual paper tax returns. If you already have filed via paper but it has not yet been processed, do not file a second tax return or write to the IRS to inquire about the status of your return or your Economic Impact Payment. Paper returns will be processed   once processing centers are able to reopen.