You can read the letter to the speaker of the House here:
President Transmits Pay Freeze for Federal Civilian Employees 2019
Since the President has transmitted an alternative plan calling for a pay freeze in 2019, Federal Civil Service employees will not see an increase in across the board GS pay or locality pay in 2019 unless it is specifically enacted by legislation in the Congress.
WhiteHouse.gov 
FEB.gov 
Data.gov 
USASpending.gov 
USA.gov 
OPM.gov