According to TruthOrFiction.com https://www.truthorfiction.com/did-dwight-eisenhower-say-someday-someone-will-claim-it-never-happened-in-1945/, this sentence first appeared in a letter to the editor published on DominicanToday.com, accompanied with the words "he did this because he said in words to this effect". It was probably a paraphrase of the above bold sentence.
Disputed
Quotes about somewhere
page 3
“Somewhere between a friend and acquaintance—a frequaintance, as it were.”
Source: Dash & Lily's Book of Dares
“It's so laughable that it's somewhere beyond comedy and right into tragedy again.”
“After all, the wrong road always leads somewhere.”
Kelsier, Chapter 13
Source: Mistborn: The Final Empire (2006)
“If you don't know where you are going you will end up somewhere else”
Variant: If you don't know where you are going,
you'll end up someplace else.
Source: The Yogi Book : I Really Didn't Say Everything I Said
“Almost all good writing begins with terrible first efforts. You need to start somewhere.”
Source: Bird by Bird: Some Instructions on Writing and Life
“A village somewhere was missing it's idiot.”
Source: Drop Dead Gorgeous
Source: Random Harvest
“Everything we care about lies somewhere in the middle, where pattern and randomness interlace.”
Source: The Information: A History, a Theory, a Flood
Source: Traveling Mercies: Some Thoughts on Faith
“Somewhere along the line I'd lost the will not to eat.”
Source: How I Live Now
“Somewhere in the depths of solitude, beyond wilderness and freedom, lay the trap of madness.”
Source: The Monkey Wrench Gang (1975)
“Sometimes you have to go somewhere else to appreciate what we have here.”
Source: The Dragon Heir
“… in an infinite universe, anything that could be imagined might somewhere exist.”
Source: Dead and Alive
Source: Dark of Night
Source: Sweep: Volume 1
Source: The Child That Books Built: A Life in Reading
Source: Running from Safety: An Adventure of the Spirit
“Where does one go from a world of insanity? Somewhere on the other side of despair.”
“Happiness is a mysterious thing, to be found somewhere between too little and too much.”
Source: A Book of Simple Living
Variant: Jackass!" Eve yelled.
"You know, when people say that, I just hear the word awesome," Shane said.
Source: Last Breath
War with Honour http://books.google.com/books?id=QmQDAAAAMAAJ&q="I+wrote+somewhere+once+that+the+third+rate+mind+was+only+happy+when+it+was+thinking+with+the+majority+the+second+rate+mind+was+only+happy+when+it+was+with+the+minority+and+a+first+rate+mind+was+only+happy+when+it+was+thinking", Macmillan War Pamphlets, Issue 2 (1940).
“As you grow ready for it, somewhere or other you will find what is needful for you in a book.”
Source: The Marquis of Lossie
Source: When Darkness Comes
“Ballycumber (ba-li-KUM-ber) n.
One of the six half-read books lying somewhere in your bed.”
Source: The Deeper Meaning of Liff
“The helpful thought for which you look
Is written somewhere in a book.”
“Somewhere between fear and sex passion is. The way there is sudden. The way out is worse.”
Source: The Passion (1987)